You are given four bulbs of 25W, 40W, 50W and 60W. Which bulb has the lowest resistance?
Correct answer: B. 60 W
- A. 25 W
- B. 60 W
- C. 50 W
- D. 40 W
Explanation
The resistance of high power devices is smaller than the low power ones. The resistance of 60 watt bulb is smaller than 40 watt bulb and so on P=V2/R For a given voltage, P = 1/R. So, 60 W bulb has the lowest resistance.
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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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