# Calculating the power transformed in a real battery

## Homework Statement

There is a battery producing emf V and the current around the circuit is I. The battery has an internal resistance of R. What is the power transformed by the battery

P = VI
P= I2R

## The Attempt at a Solution

Maybe P=VI+I2R because there is some electrical energy converted in the cell resulting in the power VI And then the same power is used to create power I2R in the internal resistance.
So shouldn't it be the sum of the two powers because it is the total power transformed.

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CWatters
Homework Helper
Gold Member
Maybe P=VI+I2R because there is some electrical energy converted in the cell resulting in the power VI And then the same power is used to create power I2R in the internal resistance.
I think you are on the right lines but your explanation isn't very clear.

What do you mean by "then the same power is used" ?

Electrical power produced by cell = Input power to internal resitance

CWatters