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When potentiometer is used for the measurement of power, the output of Volt-Ratio box is normally:

When potentiometer is used for the measurement of power, the output of Volt-Ratio box is normally: Correct Answer 1.5 V

DC potentiometer:

  • The potentiometer is a voltage measuring device.
  • The potentiometer measures voltage or potential difference by comparing an unknown voltage with a known voltage.
  • DC potentiometer can measure voltages up to about 1.5 V only.
  • So when a high voltage is applied, a volt ratio box is used to reduce the unknown voltage so that it can be measured by dc potentiometer.

Circuit diagram of a DC potentiometer:

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Working of a DC potentiometer:

  • The switch S is connected to calibrate position, which connects the standard cell to the circuit. This standard cell helps in standardizing the potentiometer.
  • Now the switch S is put in the operating position and the galvanometer key is kept open.
  • The battery connected in series with the rheostat supplies the working current. 
  • The unknown voltage E1 is measured by finding a position for the sliding contact such that the galvanometer shows zero deflection.
  • The zero deflection represents that the unknown voltage E1 is equal to the voltage drop E2.

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