Question

A battery has an emf of 3.15 V and produces a current of 12 A when connected across its terminals. What is its internal resistance

Answer 1

According to Ohm's Law, if the voltage applied to a circuit is V and a current I flows through it, then the resistance R of the circuit is given by:

`R=(V)/(I)`

Replace V=3.15V and I=12A to find the resistance of the circuit:

`R=(3.15V)/(12A)=0.2625\Omega`

Therefore, the internal resistance of the battery is approximately 0.26 ohms.