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Difficulty: MediumResistors and Potentiometers

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.

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

Answer

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.

Step-by-Step Solution

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/RI = V/R).

Key Concept

Functional and structural distinction between three-terminal potentiometers (voltage division) and two-terminal rheostats (current limiting)
Estimated Time:45s
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Topics

Resistors and Potentiometers

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