A laptop runs on an 11.4 V battery and uses 8.3 W. What is the current delivered by the battery to the computer?

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Study for the UCF PHY2054 General Physics Exam. Use flashcards and multiple-choice questions complete with hints and explanations. Boost your understanding and get exam-ready!

Multiple Choice

A laptop runs on an 11.4 V battery and uses 8.3 W. What is the current delivered by the battery to the computer?

Explanation:
Power equals voltage times current, so the current drawn is the power divided by the voltage. With 8.3 W and 11.4 V, the current is I = P/V = 8.3/11.4 ≈ 0.728 A. This means the laptop draws about 0.73 amps from the battery. Other currents would imply powers far from 8.3 W: for example, 8.3 A at 11.4 V would be about 95 W, and 0.083 A would be roughly 1 W, so they don’t match the given power.

Power equals voltage times current, so the current drawn is the power divided by the voltage. With 8.3 W and 11.4 V, the current is I = P/V = 8.3/11.4 ≈ 0.728 A. This means the laptop draws about 0.73 amps from the battery.

Other currents would imply powers far from 8.3 W: for example, 8.3 A at 11.4 V would be about 95 W, and 0.083 A would be roughly 1 W, so they don’t match the given power.

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