Which of the following bulb has the least resistance?
Correct answer: B. 300 W
- A. 150 W
- B. 300 W
- C. 50 W
- D. 100 W
Explanation
P = V2/R (where V = voltage and R = resistance) implies that the lower the resistance connected to a given voltage source, the greater the power delivered. When the resistance is very high, very little current flows, and therefore, the power output of the battery decreases. Additionally, the resistor won't get too warm because there is less power. If you reduce the resistance, more current will flow and the resistor will get warmer because you have increased the power. Hence, the bulb with the greatest power i.e. 300 W will have the least 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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