Which of the following bulbs has the least resistance:
Correct answer: D. 300W
- A. 50 W
- B. 100 W
- C. 200W
- D. 300W
Explanation
Among the given options, the 300W bulb has the highest power rating. As per the formula P= V^2/R, a higher power rating corresponds to lower resistance (R). Therefore, the 300W bulb will have the least resistance compared to the other options.
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About Current Electricity
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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