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Difficulty: EasyResistors and Potentiometers

An electronic circuit uses a standard four-band resistor with the color bands Yellow, Violet, Brown, and Gold reading from left to right. What is the nominal resistance value of this resistor in ohms (Ω\Omega)?

Answer: 470 $\Omega$

Answer

The nominal resistance value is 470 Ω470\ \Omega.
In the standard electronic color code system, Yellow represents 4, Violet represents 7, Brown represents a multiplier of 10 (10110^1), and Gold indicates a tolerance of ±5%\pm 5\%. Combining the digits gives 47, and multiplying by 10 produces 470 Ω470\ \Omega.

Step-by-Step Solution

1
Decode the first two color bands into the first two digits
Yellow corresponds to 4 and Violet corresponds to 7, giving the base number 47
The first two bands on a four-band resistor represent the first and second significant figures of the resistance value
2
Decode the third band into the decimal multiplier
Brown corresponds to a multiplier of 10110^1 (1010)
The third band indicates the power of ten by which the base number must be multiplied
3
Calculate the total nominal resistance
47×10=470 Ω47 \times 10 = 470\ \Omega
Multiplying the base digits by the multiplier gives the rated nominal resistance in ohms

Key Concept

Four-band resistor color code decoding
Estimated Time:30s
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Topics

Resistors and Potentiometers

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