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9 July, 04:21

If 5.0 x 10^21 electrons pass through a 20-Ω resistor in 10 min, what is the potential difference across the resistor?

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  1. 9 July, 07:33
    0
    26.67 Volt

    Explanation:

    number of electrons, n = 5 x 10^21

    R = 20 ohm

    t = 10 min = 10 x 60 = 600 sec

    V = ?

    q = n x charge of one electron

    q = n x e

    q = 5 x 10^21 x 1.6 x 10^-19 = 800 C

    i = q / t = 800 / 600 = 4 / 3 A

    According to Ohm's law

    V = i x R

    V = 4 x 20 / 3 = 26.67 Volt
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