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A battery delivering a current of 55.9 A to a circuit has a terminal voltage of 13.5 V. The electric power bei?

A battery delivering a current of 55.9 A to a circuit has a terminal voltage of 13.5 V. The electric power being dissipated by the internal resistance of the battery is 252 W. Find the emf of the battery.

thanks in advance!

Since there is 55.9 amps being delivered to the circuit, that is also the load current.

Because this battery has a terminal voltage of 13.5 volts, this means that there is 13.5 volts available at the battery terminals.

By definition,
battery EMF = terminal voltage + internal resistance voltage drop.
You are given the terminal voltage and want to know the battery EMF. Therefore, you need the internal resistance voltage drop to solve this.

The load current flows through both the load resistance and the internal resistance and it is given. So you know the internal resistance current. You also know the internal resistance power dissipation since it is also given. Therefore, using Ohm's Law, you now have enough information to calculate the internal resistance voltage drop.

Returning to the equation
battery EMF = terminal voltage + internal resistance voltage drop, with the terminal voltage given and the internal resistance voltage drop calculated, you can solve for the battery EMF.

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