What can be used as the unit of energy?
Correct answer: A. watt × second
- A. watt × second
- B. volt × meter
- C. volt per coulomb
- D. Newton per meter
Explanation
The unit of power is the watt, and hence the unit of energy is watt-second since energy is the product of power and time. The watt-second is referred to as joules. From the formula energy = power × time E = Pt
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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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