EMF becomes equal to the terminal potential difference when:
Correct answer: C. Circuit is open
- A. Circuit is closed
- B. Current is maximum
- C. Circuit is open
- D. All of these
Explanation
Electromotive force (EMF) is equal to the terminal potential difference when no current flows and In the open circuit the current can not flow from one end of the power source to the other so the answer is C. (note: circuit is open means that the switch is turned off.)
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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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