A 250V bulb passes a current of 0.3A. Calculate the power in the lamp.
Correct answer: B. 75 W
- A. 50 W
- B. 75 W
- C. 100 W
- D. 90 W
Explanation
Power = VI. Given that current = 3A and Voltage = 250VSo, 0.3 x 250 = 75 W
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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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