If 'V' is applied potential difference across a resistance 'R', then loss in potential energy per unit time is:
Correct answer: D. All of the above
- A. VI
- B. I2R
- C. V2/R
- D. All of the above
Explanation
The correct answer is D, 'All of the above', because each option provides a valid formula for calculating power in an electrical circuit. Power is defined as the rate of energy transfer. Option A (VI), Option B (I2R), and Option C (V2/R) are all equivalent expressions that describe power dissipation based on different parameters of the circuit. Therefore, all options correctly represent the loss in potential energy per unit time.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Power
Power is the rate at which work is done or energy is transferred, with average power calculated over a time interval and instantaneous power found from P = Fv when force and velocity are aligned. Work includes units, mechanical efficiency, and the distinction between power and total work or energy.
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