A common household light bulb draws about how many amperes?

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Multiple Choice

A common household light bulb draws about how many amperes?

Current drawn by a common household bulb can be estimated with I = P / V, where P is the bulb’s wattage and V is the supply voltage. In the U.S., standard residential voltage is about 120 V, and a typical bulb is around 100 W, so I ≈ 100 W / 120 V ≈ 0.83 A, which is roughly 1 amp. That makes 1 amp the best rounded estimate among the options for a familiar household bulb. The other values would correspond to noticeably different wattages: 0.5 amp would imply about 60 W, 2 amps would imply about 240 W, and 3 amps would imply about 360 W, none of which are as representative of a common bulb.

Current drawn by a common household bulb can be estimated with I = P / V, where P is the bulb’s wattage and V is the supply voltage. In the U.S., standard residential voltage is about 120 V, and a typical bulb is around 100 W, so I ≈ 100 W / 120 V ≈ 0.83 A, which is roughly 1 amp. That makes 1 amp the best rounded estimate among the options for a familiar household bulb. The other values would correspond to noticeably different wattages: 0.5 amp would imply about 60 W, 2 amps would imply about 240 W, and 3 amps would imply about 360 W, none of which are as representative of a common bulb.

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