A lamp is connected to a 12-volt battery. An ammeter indicates a current of 5 mps. The watt of the lamp is:
Correct answer: C. 60 watts
- A. 2.4 watts
- B. 120 watts
- C. 60 watts
- D. 300 watts
Explanation
The question is asking for the watt or power of the lamp. We know that P = IV and we are given that I = 5 amps and V = 12 volts. P = 5x12 P = 60 W Therefore, C is the correct answer
This question appeared on the ETEA MDCAT 2005 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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