Question

A battery has a terminal voltage of 5 volts when a current of 500 milliamps flows through it. The internal resistance of the battery is 5 ohms. Calculate E, the internal voltage (EMF), of the battery.

Answer 1

Answer:

2.5 volts

Explanation:

Terminal voltage of the battery is given as V =5 volts

Current through the battery $i=500mA=0.5A$

Internal resistance of the battery R = 5 ohm

For the any batter we know that $V=E+iR$

Where V is terminal voltage E is EMF of the battery and R is the internal resistance

So $5=E+0.5\times 5$

$E=5-2.5=2.5volts$