How does the energy used by a 100 cap w lightbulb compare with the energy used by a 40 cap w lightbulb in a given amount of time?

Power measures how quickly energy is used. Over the same amount of time, compare the bulbs’ powers: 100 W ÷ 40 W = 2.5. So the 100 W bulb uses 2.5 times as much energy as the 40 W bulb, making “The 100 W bulb uses 2.5 times more energy” correct.

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