The purpose of using a potentiometre in an electric circuit is to
Correct answer: B. Compare two voltages.
- A. Measure resistance.
- B. Compare two voltages.
- C. Measure alternating current.
- D. Compare alternating and direct current.
Explanation
The correct answer is Option B: A potentiometer is primarily used to compare two voltages. It is a type of variable resistor that can be adjusted to measure the difference in electrical potential between two points. This makes it useful for calibrating and comparing voltage levels, rather than measuring current or resistance directly. Option A is incorrect because measuring resistance is the function of an ohmmeter. Option C is incorrect because a potentiometer does not measure current, whether alternating or direct; it measures voltage. Option D is incorrect because the device does not compare alternating and direct currents; it is used for voltage comparison.
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