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  4. The electromotive force of primary cell is 2 V . When it is short circuited it gives a current of 4 A . Its internal resistance in ohm is

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Q. The electromotive force of primary cell is $ 2\,V $ . When it is short circuited it gives a current of $ 4\,A $ . Its internal resistance in ohm is

Punjab PMETPunjab PMET 2011Current Electricity

Solution:

When cell is short circuited, then total resistance is equal to internal resistance of coil.
$E=i r$
$r=\frac{E}{i}=\frac{2}{4}=0.5\, ohm$