Question

An electric lamp uses energy at the rate of

48 W on a 12 V supply.

How much charge passes through the lamp in

2.0 seconds ?​

Answer 1

Answer:

8 Coulombs

Explanation:

Since V x A = Watts.

Hence Amperes = Watts/Volts, ie, current flow is watts divided by volts.

In this bulb, 48 Watts/12 Volts = 4 amperes

One ampere is one coulomb of charge passing in one second.

Hence the answer, for 2 seconds, is 4 amps x 2 seconds, that is, EIGHT COULOMBS of charge pass through this bulb in two seconds.

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