Q6 of 44 Page 85

If 400 mA current flows through the bulb for 1 minute, how many electrons will pass through it?

Given

Current (I) = 400mA = 0.4A


Time (t) = 1min = 60sec


Formula



I = current


Q = charge


T = time


Q = I x t


Q = 0.4A x 60 sec


Q = 24 C


Since 1 coulomb contains 0.625 x 1019 electrons


Hence 24 C contains 24 x 0.625 x 1019 electrons


= 15 x 1019 electrons


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