2023
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the power of a lightbulb hooked up to a 12 V battery with an internal resistance of 10 Ohms?
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7 W
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14 W
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20 W
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32 W
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Explanation:
Detailed explanation-1: -For 120 v it will be 10x what it is for 12 v. But assuming 12 v, approximately . 85 ohms.
Detailed explanation-2: -So, a 12 V bulb will have a resistance of 144/W, while a 6 volt bulb will have a resistance of 36/W. For equal wattage bulbs, the 12V bulb will have 4 times the resistance as the 6V bulb.
Detailed explanation-3: -Internal resistance of a 12V car battery is 0.02.
Detailed explanation-4: -A resistor of 10 connected across a cell of emf 12 V, draws the current of 1.1 A.
There is 1 question to complete.