Internal resistance and emf of a cell can be determined by an instrument
Correct answer: D. potentiometer
- A. CRO
- B. AVO meter
- C. both CRO & AVO meter
- D. potentiometer
Explanation
A potentiometer is an instrument used to measure the electromotive force (emf) and internal resistance of a cell accurately.Incorrect options: (a) A Cathode Ray Oscilloscope (CRO) is not typically used to measure the internal resistance and emf of a cell.(b) An Ammeter-Voltmeter (AVO meter) is primarily used for measuring current and voltage in a circuit, not specifically for determining the internal resistance and emf of a cell.(c) While a potentiometer can measure both the emf and internal resistance, a CRO and AVO meter are not typically used for this purpose.
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About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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