A 100W ,200V bulb is connected to a 160V supply. The actual power consumption would be:
Correct answer: B. 72 W
- A. 64 W
- B. 72 W
- C. 100 W
- D. neutral particles
Explanation
The power consumed by the bulb can be calculated using the formula P=V2/R, where P is power, V is voltage and R is resistance. In this case, with 160V supply instead of the designed 200V, the new power consumption is 1602/2002 x 100W= 72W
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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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