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20 April, 00:46

A light bulb is rated at 30 w when operated at 120 v. how much charge enters (and leaves) the light bulb in 1.0 min?

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  1. 20 April, 00:51
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    Power in a circuit = V. I

    30 = (120) (I)

    I = 0.25 A

    We know, current is the rate of flow of charge per unit time. This means 0.25 A corresponds to the flow of 0.25 C of charge every second.

    That implies, in a minute 0.25 x 60 = 15 C of charge flows.
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