Why is no power consumed from the circuit containing unknown emf when a potentiometer is used to measure the unknown emf
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The working of potentiometer is as follows :
Explanation:
- Potentiometer is a voltage divider used for measuring electric potential across the circuit.
- When the potentiometer is used to measure the unknown emf, there is no power consumed from the circuit containing unknown emf.
- Potentiometer is a null comparison method. The unknown emf and the potential difference across the balancing length of the potentiometer wire are in opposition at the balance point.
- As a result, the branch containing the unknown emf draws no current from the circuit are the null point.
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Potentiometer
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No power consumed by potentiometer:
- Potentiometer is an electrical instrument used to change the resistance of the circuit. The unknown emf is measured by comparing the value of the standard emf.
- It works based on the null method where it adjusts the value of the circuit until the reading becomes "zero".
- Since, it works by adjusting and comparing the emf in the circuit, it draws no power from the circuit.
- It uses wiper in the middle and two ends are terminals.
- When the wiper is closer to terminal, the circuit has less resistance. When the wiper is away from the terminal, the circuit has more resistance.
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