To measure an AC voltage by using a potentiometer, it is desirable that the supply for the potentiometer is taken _.
Correct answer: C. From the same source as the unknown voltage
- A. From a source which is not the same as the unknown voltage
- B. From a battery
- C. From the same source as the unknown voltage
- D. Any of the above options are correct
Explanation
It is desirable to take the supply for the potentiometer from the same source as the unknown voltage in order to measure the AC voltage. Hence Option C is correct.
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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