Resistors and Potentiometers Alıştırma Soruları — Armed Services Vocational Aptitude Battery (ASVAB) — Sayfa 2

Soru 21Soru →

A technician connects a digital multimeter across terminal 1 (the counter-clockwise outer terminal) and terminal 2 (the center wiper) of a $10\text{ k}\Omega$ rotary potentiometer. If the control shaft is rotated fully clockwise toward terminal 3, what resistance value should the multimeter display?

0\ \Omega

10\text{ k}\Omega

5\text{ k}\Omega

Infinite resistance

Cevabı ve açıklamayı göster

Cevap: $10\text{ k}\Omega$

Cevap

The multimeter will display the full rated resistance of

10\text{ k}\Omega

.

A rotary potentiometer contains a continuous resistive track between two outer fixed terminals (terminals 1 and 3) and a movable wiper contact (terminal 2). When the shaft is rotated fully clockwise toward terminal 3, the wiper moves to the extreme end of the resistive track at terminal 3. Consequently, the multimeter connected across terminal 1 and terminal 2 spans the entire length of the resistive element, displaying the full nominal rating of

10\text{ k}\Omega

.

Adım Adım Çözüm

1

Identify the internal construction and terminal functions of a standard three-terminal potentiometer.

Terminal 1 and terminal 3 connect to the opposite fixed ends of the internal

10\text{ k}\Omega

resistive strip, while terminal 2 connects to the movable wiper contact.

Understanding the internal layout establishes how rotation alters the length of resistive material between any two terminals.

2

Determine the physical position of the wiper relative to terminal 1 after rotating fully clockwise toward terminal 3.

Rotating clockwise shifts the wiper (terminal 2) all the way to terminal 3, placing the maximum possible distance of the resistive track between terminal 1 and terminal 2.

Electrical resistance is directly proportional to the length of resistive material between the two meter probes.

3

Calculate the measured resistance across terminal 1 and terminal 2.

The meter measures the complete length of the track, indicating

10\text{ k}\Omega

.

With the wiper at terminal 3, the resistance between terminal 1 and terminal 2 equals the total nominal resistance of the potentiometer (

10\text{ k}\Omega

), while the resistance between terminal 2 and terminal 3 drops to

0\ \Omega

.

Anahtar Kavram

Potentiometer terminal configuration and variable wiper resistance behavior

Tahmini Süre:45s

Soru 22Soru →

A rotary potentiometer has a total resistance of $50\text{ k}\Omega$ across its two outer fixed terminals (Terminals A and C). If the center wiper (Terminal B) is adjusted so that the resistance between Terminal A and Terminal B is $32\text{ k}\Omega$ , what is the resistance between Terminal B and Terminal C?

32\text{ k}\Omega

18\text{ k}\Omega

82\text{ k}\Omega

1.8\text{ k}\Omega

Cevabı ve açıklamayı göster

Cevap: $18\text{ k}\Omega$

Cevap

The resistance between Terminal B and Terminal C is

18\text{ k}\Omega

.

A potentiometer contains a single continuous resistive track between its two outer terminals (

A

and

C

). The center wiper (

B

) contacts this track at an intermediate point, splitting the total resistance into two complementary series sections such that

R_{AC} = R_{AB} + R_{BC}

. Given a total resistance of

50\text{ k}\Omega

and a segment of

32\text{ k}\Omega

, the remaining segment between the wiper and the other outer terminal must be

50\text{ k}\Omega - 32\text{ k}\Omega = 18\text{ k}\Omega

.

Adım Adım Çözüm

1

Identify the relationship between the three terminals of a potentiometer.

The total resistance between outer terminals A and C equals the sum of the two sub-segments created by wiper B:

R_{AC} = R_{AB} + R_{BC}

.

A potentiometer consists of a single continuous resistive element where the movable wiper divides the total track into two series-connected resistive portions.

2

Subtract the known segment resistance from the total end-to-end resistance to find

R_{BC}

.

R_{BC} = 50\text{ k}\Omega - 32\text{ k}\Omega = 18\text{ k}\Omega

.

Isolating

R_{BC}

algebraically provides the remaining resistance along the element to the opposite outer terminal.

Anahtar Kavram

Potentiometer resistive track division

Tahmini Süre:45s

Soru 23Soru →

A bench technician uses a $100\text{ k}\Omega$ linear potentiometer as an adjustable control element in a circuit. If the wiper is adjusted to $75\%$ of its full mechanical travel away from the lower reference terminal, what is the resulting resistance between the wiper and the upper terminal in kilo-ohms ( $\text{k}\Omega$ )?

Cevabı ve açıklamayı göster

Cevap: 25

Cevap

25 kilo-ohms (

25\text{ k}\Omega

)

In a linear-taper potentiometer, the total end-to-end resistance (

100\text{ k}\Omega

) is distributed uniformly across the resistive track between the outer fixed terminals. When the wiper is moved

75\%

of the travel distance from the lower terminal, the remaining segment between the wiper and the upper terminal comprises

25\%

(

100\% - 75\%

) of the total resistance. Multiplying

100\text{ k}\Omega \times 0.25

gives

25\text{ k}\Omega

.

Adım Adım Çözüm

1

Find the percentage of the resistive element situated between the wiper contact and the upper terminal.

100\% - 75\% = 25\%

The total resistive track spans

100\%

of the component's resistance between its two outer end terminals.

2

Calculate the resistance across this upper portion of the track.

100\text{ k}\Omega \times 0.25 = 25\text{ k}\Omega

Because the potentiometer is linear, resistance is directly proportional to the physical position of the wiper along the track.

Anahtar Kavram

Linear potentiometer terminal division and wiper position relationships

Alternatif Yöntem

Calculate the resistance from the lower terminal to the wiper first (

100\text{ k}\Omega \times 0.75 = 75\text{ k}\Omega

), and subtract that value from the total resistance:

100\text{ k}\Omega - 75\text{ k}\Omega = 25\text{ k}\Omega

.

Tahmini Süre:45s

Soru 24Soru →

Complete the statement describing how variable resistive components are configured and classified in basic electronic circuits. Fill in the blanks with the correct component names.

Aşağıdaki boşlukları doldurun

A three-terminal variable resistor utilized to provide an adjustable voltage output is called a , whereas a two-terminal variable resistor used primarily to regulate current flow in a circuit is known as a .

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Cevap

Blank 1: potentiometer; Blank 2: rheostat

A potentiometer uses three terminals to create an adjustable voltage divider, whereas a rheostat uses two terminals connected in series to vary resistance and regulate circuit current.

Adım Adım Çözüm

1

Identify the component type and function for a three-terminal variable resistor used for voltage control

A potentiometer connects across all three terminals (two outer ends and a center wiper) to function as a variable voltage divider.

The wiper taps off an adjustable fraction of the total voltage applied across the outer resistive track.

2

Identify the component type and function for a two-terminal variable resistor used for current control

A rheostat uses only two connection points (one end and the wiper) wired in series with the load to vary total circuit resistance.

By changing series resistance directly, the rheostat regulates the magnitude of current flow according to Ohm's law (

I = V/R

).

Anahtar Kavram

Functional and structural distinction between three-terminal potentiometers (voltage division) and two-terminal rheostats (current limiting)

Tahmini Süre:45s

Soru 25Soru →

An electronics technician is replacing a scorched four-band resistor on a circuit board. The original component has the color sequence Blue, Gray, Brown, and Gold. What is the nominal resistance and tolerance of this resistor?

6.8\text{ k}\Omega \pm 5\%

68\ \Omega \pm 5\%

680\ \Omega \pm 5\%

570\ \Omega \pm 5\%

Cevabı ve açıklamayı göster

Cevap: $680\ \Omega \pm 5\%$

Cevap

680\ \Omega \pm 5\%

According to standard electronic color code conventions, blue represents the digit 6, gray represents 8, brown denotes a multiplier of 10 (or

10^1

), and gold denotes a

\pm 5\%

tolerance. Combining these yields

68 \times 10 = 680\ \Omega \pm 5\%

.

Adım Adım Çözüm

1

Determine the first two significant digits from the first and second color bands.

The first band (Blue) is

6

and the second band (Gray) is

8

, forming the number

68

.

In a standard four-band resistor code, the first two bands represent significant digits.

2

Apply the decimal multiplier from the third color band.

The third band (Brown) represents a multiplier of

10^1 = 10

, yielding

68 \times 10 = 680\ \Omega

.

The third band specifies the power of ten by which the significant digits are multiplied.

3

Identify the tolerance percentage from the fourth color band.

The fourth band (Gold) designates a tolerance of

\pm 5\%

.

Gold in the fourth position standardly denotes a

\pm 5\%

manufacturer tolerance rating.

Anahtar Kavram

Four-band resistor color code decoding and tolerance interpretation

Tahmini Süre:35s

Soru 26Soru →

Standard four-band carbon composition and film resistors use color-coded bands to indicate their nominal resistance values and tolerances. Match each four-band resistor color code sequence on the left to its corresponding nominal resistance value on the right.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

Orange, Orange, Brown, Gold pairs with

330\ \Omega \pm 5\%

; Brown, Black, Red, Gold pairs with

1.0\text{ k}\Omega \pm 5\%

; Yellow, Violet, Orange, Gold pairs with

47\text{ k}\Omega \pm 5\%

; and Green, Blue, Yellow, Gold pairs with

560\text{ k}\Omega \pm 5\%

.

Each resistor color code sequence maps to its nominal value by combining the first two color values as base digits and multiplying by ten raised to the value of the third color: Orange-Orange-Brown gives

33 \times 10^1 = 330\ \Omega

; Brown-Black-Red gives

10 \times 10^2 = 1.0\text{ k}\Omega

; Yellow-Violet-Orange gives

47 \times 10^3 = 47\text{ k}\Omega

; and Green-Blue-Yellow gives

56 \times 10^4 = 560\text{ k}\Omega

. All fourth bands are Gold, representing a

\pm 5\%

tolerance.

Adım Adım Çözüm

1

Decode the significant digits for each color sequence using the standard EIA color code chart.

Orange-Orange is

33

, Brown-Black is

10

, Yellow-Violet is

47

, and Green-Blue is

56

.

In a standard four-band resistor, the first two bands always represent the first and second significant digits.

2

Determine the power-of-ten multiplier from the third band and apply metric prefixes.

Brown multiplier is

10^1

(

33 \times 10 = 330\ \Omega

); Red multiplier is

10^2

(

10 \times 100 = 1.0\text{ k}\Omega

); Orange multiplier is

10^3

(

47 \times 1,000 = 47\text{ k}\Omega

); Yellow multiplier is

10^4

(

56 \times 10,000 = 560\text{ k}\Omega

).

The third color band represents the number of trailing zeros (the multiplier

10^n

).

3

Identify the tolerance rating from the fourth band.

All four sequences end in Gold, which corresponds to

\pm 5\%

.

Gold in the fourth position designates a standard

\pm 5\%

manufacturing tolerance.

Anahtar Kavram

Four-band resistor color code decoding and metric unit conversion

Tahmini Süre:1m 0s

Soru 27Soru →

A four-band resistor removed from an amplifier circuit displays the color band sequence Yellow, Violet, Red, and Gold. When measured with an ohmmeter, which range represents the acceptable resistance values for this component to be within manufacturer tolerance?

4,230\ \Omega\text{ to }5,170\ \Omega

446.5\ \Omega\text{ to }493.5\ \Omega

4,465\ \Omega\text{ to }4,935\ \Omega

4,653\ \Omega\text{ to }4,747\ \Omega

Cevabı ve açıklamayı göster

Cevap: $4,465\ \Omega\text{ to }4,935\ \Omega$

Cevap

The acceptable tolerance range is

4,465\ \Omega\text{ to }4,935\ \Omega

.

Decoding the four bands gives Yellow (4), Violet (7), Red (multiplier of

100

), and Gold (

\pm 5\%

tolerance). The nominal resistance is

47 \times 100 = 4,700\ \Omega

. Five percent of

4,700\ \Omega

is

235\ \Omega

. Subtracting and adding

235\ \Omega

to the nominal value yields the valid range of

4,465\ \Omega\text{ to }4,935\ \Omega

.

Adım Adım Çözüm

1

Decode the significant digits and multiplier from the first three color bands.

Yellow = 4, Violet = 7, Red =

\times 10^2

(

100

). Nominal resistance =

47 \times 100 = 4,700\ \Omega

.

The standard EIA four-band color code uses the first two bands for significant digits and the third band as a decimal multiplier.

2

Determine the tolerance percentage from the fourth band.

Gold =

\pm 5\%

.

The fourth band specifies the manufacturing tolerance rating.

3

Calculate the allowable deviation in ohms.

4,700\ \Omega \times 0.05 = 235\ \Omega

.

Multiplying the nominal resistance by the tolerance percentage gives the maximum allowable variation.

4

Calculate the lower and upper limits of acceptable resistance.

Lower Limit:

4,700\ \Omega - 235\ \Omega = 4,465\ \Omega

; Upper Limit:

4,700\ \Omega + 235\ \Omega = 4,935\ \Omega

.

Adding and subtracting the allowable deviation establishes the operational boundaries.

Anahtar Kavram

Four-band resistor color code decoding and percentage tolerance range calculation

Tahmini Süre:45s

Soru 28Soru →

A carbon-film resistor has four distinct color bands in sequence: Red, Violet, Orange, and Gold. What is the minimum acceptable resistance of this resistor in kilohms ( $\text{k}\Omega$ ) based on its color code and tolerance rating?

Cevabı ve açıklamayı göster

Cevap: 25.65

Cevap

The minimum acceptable resistance is 25.65 kilohms (kΩ).

According to the standard EIA 4-band resistor color code, Red = 2, Violet = 7, Orange = multiplier 10^3 (1,000), and Gold = ±5% tolerance. The nominal resistance is 27 × 1,000 Ω = 27,000 Ω = 27 kΩ. The allowable variation is 5% of 27 kΩ, which is 1.35 kΩ. Subtracting this from the nominal value gives a minimum acceptable resistance of 27 kΩ - 1.35 kΩ = 25.65 kΩ.

Adım Adım Çözüm

1

Identify the significant digits from the first two color bands.

Red represents 2 and Violet represents 7, forming the base number 27.

In standard 4-band resistor color codes, the first two bands represent the first two significant figures.

2

Apply the decimal multiplier from the third color band and convert to kilohms.

Orange represents a multiplier of 10^3 (1,000), giving a nominal value of 27 × 1,000 Ω = 27,000 Ω = 27 kΩ.

The third band indicates the power of ten by which the significant digits are multiplied.

3

Calculate the tolerance value based on the fourth band.

Gold indicates a ±5% tolerance. 5% of 27 kΩ is 0.05 × 27 kΩ = 1.35 kΩ.

The fourth band specifies the allowable percentage deviation from the nominal resistance value.

4

Compute the lower limit of the allowable resistance range.

27 kΩ - 1.35 kΩ = 25.65 kΩ.

The minimum acceptable value is obtained by subtracting the allowable tolerance from the nominal resistance.

Anahtar Kavram

Four-Band Resistor Color Code and Tolerance Calculation

Alternatif Yöntem

Calculate the minimum multiplier directly: 27 kΩ × (1 - 0.05) = 27 kΩ × 0.95 = 25.65 kΩ.

Tahmini Süre:45s

Soru 29Soru →

An electronics technician needs to replace a damaged component on a circuit board with an $820\ \Omega$ resistor having a $\pm 5\%$ tolerance. Which four-band color code sequence identifies the correct replacement resistor?

Gray, Red, Black, Gold

Gray, Red, Brown, Gold

Gray, Red, Red, Gold

Red, Gray, Brown, Gold

Cevabı ve açıklamayı göster

Cevap: Gray, Red, Brown, Gold

Cevap

Gray, Red, Brown, Gold

The color band sequence Gray, Red, Brown, Gold translates directly to

8

(Gray),

2

(Red),

\times 10^1

(Brown), and

\pm 5\%

(Gold). Multiplying the significant digits

82

by

10

yields exactly

820\ \Omega

with a

\pm 5\%

tolerance.

Adım Adım Çözüm

1

Determine the first two significant digits from the target resistance value.

The first digit is

8

(Gray) and the second digit is

2

(Red).

Standard four-band resistors use the first two bands to represent significant numerical digits.

2

Calculate the multiplier needed to obtain

820\ \Omega

from the significant digits

82

.

82 \times 10^1 = 820\ \Omega

, which corresponds to the multiplier color Brown.

The third band represents the power of ten multiplier (

10^1 = 10

, which is Brown).

3

Identify the tolerance band corresponding to

\pm 5\%

.

A

\pm 5\%

tolerance is denoted by Gold.

The fourth band indicates manufacturing tolerance, where Gold designates

\pm 5\%

and Silver designates

\pm 10\%

.

Anahtar Kavram

Four-Band Resistor Color Code Decoding

Tahmini Süre:40s

Soru 30Soru →

Complete the statement regarding fixed resistor specifications and heat dissipation.

Aşağıdaki boşlukları doldurun

A resistor's ability to safely dissipate electrical energy as heat is measured in , and among standard carbon-composition resistors, a physically larger package indicates a power rating.

Cevabı ve açıklamayı göster

Cevap

watts (or W) and higher (or greater / larger)

Resistors convert electrical energy into heat during circuit operation. The rate of heat dissipation is rated in watts (W). Because standard carbon-composition and film resistors do not use color bands for wattage, their power ratings (such as 1/8 W, 1/4 W, 1/2 W, 1 W, or 2 W) are identified by their physical dimensions: larger physical dimensions provide greater surface area to radiate heat, allowing for a higher power rating.

Adım Adım Çözüm

1

Identify the standard electrical unit for power dissipation in resistive components.

Power is measured in watts (W).

Electrical power converted into heat by a resistor is calculated using Watt's Law (

P = I^2 R = V \times I

) and expressed in watts.

2

Determine the physical property that dictates the wattage rating of standard carbon resistors.

Physical surface area and volume determine heat dissipation, meaning larger size equals a higher power rating.

Resistor color bands only specify resistance value and tolerance, not power rating; physically larger resistors have more surface area to radiate heat without burning out.

Anahtar Kavram

Resistor Power Rating and Physical Dimensions

Tahmini Süre:45s

Soru 31Soru →

An electronics technician connects a circuit using only the two outer stationary terminals of a $10\text{ k}\Omega$ potentiometer, leaving the center wiper terminal unconnected. How will the resistance between the two connected terminals behave as the adjustment shaft is rotated?

It remains constant at

10\text{ k}\Omega

regardless of shaft rotation.

It varies smoothly from

0\ \Omega

to

10\text{ k}\Omega

as the shaft turns.

It acts as an open circuit with infinite resistance because the wiper is disconnected.

It remains fixed at

5\text{ k}\Omega

across the circuit.

Cevabı ve açıklamayı göster

Cevap: It remains constant at $10\text{ k}\Omega$ regardless of shaft rotation.

Cevap

The resistance remains constant at

10\text{ k}\Omega

regardless of shaft rotation.

A standard potentiometer has a continuous resistive element with fixed end contacts. Connecting exclusively to the two outer terminals places the entire

10\text{ k}\Omega

track in series with the circuit. Because the movable wiper is not part of the active electrical path, rotating the control shaft has no effect on the total resistance between the outer terminals.

Adım Adım Çözüm

1

Identify the internal construction of a standard three-terminal potentiometer.

A potentiometer consists of a continuous resistive track of fixed total resistance (

10\text{ k}\Omega

) connected between its two outer stationary terminals, along with an adjustable center wiper that slides along that track.

Understanding the physical arrangement determines which paths conduct current.

2

Analyze the circuit path when only the two outer terminals are connected.

Current flows through the entire continuous length of the resistive strip from one end to the other without passing through the wiper.

Since the center wiper terminal is unconnected, its mechanical movement along the track cannot alter the total length or resistance between the two fixed outer end points.

Anahtar Kavram

Potentiometer terminal anatomy and resistive track behavior

Tahmini Süre:40s

Soru 32Soru →

Match each type of resistive component to its primary electrical characteristic or circuit application.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

Metal Film Resistor matches with high precision and low electrical noise; Wirewound Resistor matches with high power dissipation and coiled alloy wire construction; Potentiometer matches with three terminals providing an adjustable voltage division; Rheostat matches with two active terminals in series regulating circuit current.

Metal film resistors are characterized by high precision and low electrical noise. Wirewound resistors are characterized by high power dissipation and coiled wire construction. Potentiometers use three terminals to divide voltage, and rheostats use two terminals to adjust current in series.

Adım Adım Çözüm

1

Identify the construction and operational profile of fixed resistor types.

Metal film resistors provide low noise and tight precision, whereas wirewound resistors provide high power and heat handling.

Film technologies provide precision at low power, while wound alloy wires allow high wattage dissipation.

2

Distinguish between the terminal configurations of variable resistors.

Potentiometers use three terminals for voltage division, while rheostats use two active terminals for series current limiting.

A three-terminal potentiometer splits an applied voltage across its track, whereas a two-terminal rheostat directly alters total series resistance.

3

Map each component identifier to its exact functional description.

Pairs are established: Metal Film to precision/low noise, Wirewound to high power/ceramic core, Potentiometer to three-terminal voltage divider, and Rheostat to two-terminal current regulator.

Each definition uniquely aligns with the physical and electrical design of the respective component.

Anahtar Kavram

Distinguishing construction, terminal configuration, and functional roles of fixed and variable resistive components.

Tahmini Süre:45s

Soru 33Soru →

A standard four-band through-hole resistor installed in an audio preamplifier has a specified nominal resistance of $47\text{ k}\Omega$ . If the first two color bands on the component are Yellow and Violet, what color must the third band be to indicate the correct multiplier?

Red

Orange

Yellow

Brown

Cevabı ve açıklamayı göster

Cevap: Orange

Cevap

Orange

Orange is the correct multiplier band because the significant digits from Yellow (4) and Violet (7) combine to form 47. Multiplying 47 by the Orange multiplier (

10^3

or

1,000

) produces

47,000\ \Omega

, which equals the specified

47\text{ k}\Omega

.

Adım Adım Çözüm

1

Determine the digits represented by the first two color bands.

Yellow corresponds to 4 and Violet corresponds to 7, forming the two-digit significant value 47.

In standard four-band EIA color coding, the first two bands establish the significant digits of the resistance value.

2

Convert the required resistance from kilohms into ohms.

47\text{ k}\Omega = 47 \times 10^3\ \Omega = 47,000\ \Omega

.

The metric prefix 'kilo' represents a factor of

1,000

(

10^3

).

3

Calculate the multiplier and identify the corresponding band color.

47,000 / 47 = 1,000 = 10^3

, which corresponds to the color Orange.

The third band indicates the power-of-ten multiplier (number of trailing zeros), where Orange denotes

10^3

.

Anahtar Kavram

Standard four-band resistor color code decoding and multiplier determination

Tahmini Süre:40s

Soru 34Soru →

A four-band resistor has color bands in the following sequence: Orange, White, Red, and Silver. Based on this color code, what is the maximum acceptable resistance value for this component in ohms ( $\Omega$ )?

Cevabı ve açıklamayı göster

Cevap: 4290

Cevap

The maximum acceptable resistance value for the resistor is

4290\ \Omega

.

The first band (Orange) equals 3, the second band (White) equals 9, and the third band (Red) represents a multiplier of 100 (

10^2

), giving a nominal resistance of

3900\ \Omega

. The fourth band (Silver) specifies a

\pm 10\%

tolerance. Ten percent of

3900\ \Omega

is

390\ \Omega

, so the maximum acceptable resistance value is

3900 + 390 = 4290\ \Omega

.

Adım Adım Çözüm

1

Decode the first two significant digit color bands.

Orange = 3, White = 9, giving base digits 39.

Standard four-band resistors use the first two bands to establish the two most significant digits.

2

Apply the multiplier from the third color band.

Red =

10^2 = 100

, so

R_{\text{nominal}} = 39 \times 100 = 3900\ \Omega

.

The third band indicates the power of ten multiplier applied to the significant digits.

3

Calculate the upper limit of the resistance range using the tolerance band.

Silver =

\pm 10\%

. Maximum limit

= 3900 + (0.10 \times 3900) = 3900 + 390 = 4290\ \Omega

.

The fourth band specifies the allowable percentage deviation from nominal resistance, and the maximum limit requires adding the tolerance value.

Anahtar Kavram

Standard four-band resistor color code decoding and percentage tolerance range calculation.

Tahmini Süre:45s

Soru 35Soru →

Complete the technical description of variable resistive components: What specific terms correctly complete the statement regarding the movable contact and the voltage-dividing component?

Aşağıdaki boşlukları doldurun

In a variable resistor, the adjustable mechanical contact that slides along the resistive track is called the , and a three-terminal device configured to provide an adjustable output voltage is known as a .

Cevabı ve açıklamayı göster

Cevap

The mechanical sliding contact is the wiper, and the three-terminal variable resistor configured to adjust voltage is a potentiometer.

A variable resistor contains a movable contact known as a wiper (or slider) that sweeps across a resistive strip. When all three terminals are utilized—two connected across a voltage source and one to the wiper—the component functions as an adjustable voltage divider called a potentiometer.

Adım Adım Çözüm

1

Identify the component's internal mechanical contact mechanism.

The adjustable element that physically traverses the resistive track is termed the wiper.

The wiper provides an electrical connection at any point along the resistive element to pick off a variable resistance value.

2

Identify the standard three-terminal variable resistor designed for voltage adjustment.

A three-terminal variable resistor acting as a voltage divider is a potentiometer.

When connected across a potential difference with the wiper serving as the variable output, it functions as an adjustable voltage divider.

Anahtar Kavram

Variable Resistor Construction and Potentiometer Operation

Tahmini Süre:45s

Soru 36Soru →

An avionics technician is inspecting a four-band carbon composition resistor on a circuit board with the color band sequence: Red, Violet, Gold, and Gold. What is the nominal resistance and tolerance rating of this resistor?

270\ \Omega \pm 5\%

2.7\ \Omega \pm 5\%

2.7\text{ k}\Omega \pm 5\%

0.27\ \Omega \pm 5\%

Cevabı ve açıklamayı göster

Cevap: $2.7\ \Omega \pm 5\%$

Cevap

The nominal resistance is

2.7\ \Omega

with a tolerance of

\pm 5\%

.

In standard four-band resistor color coding, Red represents 2, Violet represents 7, a Gold third band represents a multiplier of

0.1

, and a Gold fourth band represents

\pm 5\%

tolerance. Calculating

27 \times 0.1

gives

2.7\ \Omega \pm 5\%

.

Adım Adım Çözüm

1

Decode the first two color bands into the significant digits.

The first band (Red) represents the digit

2

, and the second band (Violet) represents the digit

7

, forming the base number

27

.

Standard four-band EIA color codes use the first two bands for the primary significant figures.

2

Apply the multiplier value indicated by the third color band.

The third band is Gold, which indicates a multiplier factor of

10^{-1}

(

0.1

). Multiplying gives

27 \times 0.1 = 2.7\ \Omega

.

When Gold appears in the multiplier band position, it denotes a decimal factor of

0.1

for low-resistance values.

3

Determine the tolerance percentage from the fourth color band.

The fourth band (Gold) designates a

\pm 5\%

manufacturing tolerance.

The fourth band identifies the allowable deviation from the nominal resistance value.

Anahtar Kavram

Four-Band Resistor Color Code with Fractional Multipliers

Tahmini Süre:40s

Resistors and Potentiometers

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