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26 October, 15:28

How many electrons leave a 9.0V battery every minute if it is connected to a resistance of 1.4? O 80x 1020 O 6.7x 1020 O 5.1 x 1021 O 24x 1021

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  1. 26 October, 15:54
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    2.4 x 10^21

    Explanation:

    V = 9 V, R = 1.4 ohm, t = 1 minute = 60 second

    Use Ohm's law

    V = I R

    I = V / R

    I = 9 / 1.4

    I = 6.43 A

    Now use Q = I t

    Q = 6.43 x 60 = 385.7 C

    Number of electrons passing in 1 minute, n

    = total charge in one minute / charge of one electron

    n = 385.7 / (1.6 x 10^-19) = 2.4 x 10^21
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