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24 December, 07:47

Suppose a car battery has an internal resistance of 0.02 ohms. The voltage between terminals when no current is flowing is 13.6 volts. (The usual value of "12 volts" for lead-acid batteries is only nominal; the actual voltage is higher.) When the battery is supplying 80 A of current to a starter motor, what is the voltage between the terminals of the battery? 1 1.6

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  1. 24 December, 07:59
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    When the battery is supplying 80A of current, the voltage drop across its internal resistance is

    V = (current) · (resistance)

    V = (80A) · (0.02 Ω)

    V = 1.6 volts

    The voltage that appears across the terminals of the battery is

    V = (13.6 - 1.6)

    V = 12.0 volts
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