To measure an A.C. voltage by using an A.C potentiometer, it is desirable that the supply for the potentiometer is taken?
Correct answer: A. From a source which is not the same 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
Explanation
The correct answer is option (a) - From a source which is not the same as the unknown voltage. This ensures that the AC potentiometer has a stable and independent reference voltage, essential for accurate measurement. Option (b) is incorrect because a battery provides DC voltage, which cannot be used with an AC potentiometer. Option (c) is not ideal as using the same source might cause inaccuracies due to potential phase or frequency differences. Option (d) is incorrect because it suggests all options are suitable, which is not the case.
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Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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