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  4. The emf of a car battery is 12 V. If internal resistance of battery is 0.4 Ω, then maximum power drawn from battery is ....... W.

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Q. The emf of a car battery is $12 \,V$. If internal resistance of battery is $0.4\, \Omega$, then maximum power drawn from battery is ....... $W$.

Gujarat CETGujarat CET 2020

Solution:

$P =\frac{ V ^{2}}{ r }$