A bulb has a current of 200A, and a voltage of 220V. Find its power
Correct answer: B. 44kW
- A. 22kW
- B. 44kW
- C. 44watt
- D. 40 kW
Explanation
The formula for electric power is P = IV. P = (200 A) × (220 V) = 44,000 W. Since 1 kW = 1000 W, this is equal to 44 kW.
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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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