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

2.5 volts

Step-by-step 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* 5`

`E=5-2.5=2.5volts`