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EMF and EMF Devices

E.m.f. of acc...

Question

E.m.f. of accumulator battery of car is 12 V and its internal resistance is 0.4 $Ω$ , then find out the maximum current drawn from the battery.

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Solution

Electromotive force (E) = 12 V
Internal resistance (r) = 0.4 $Ω$
Maximum current = $I = \frac{E}{r}$
$I = \frac{12}{0.4} = 30 a m p$

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