Power in Circuits Video Lessons

Concept

# Problem: A battery has an EMF of 12.0 volts and internal resistance of 3 ohms A 21.0-ohm resistor is connected to the battery. 0.5 Amps flow through the battery, hence 0.5 Amps flows through the 21.0-ohm resistor The potential difference across the 21.0-ohm resistor is 10.5 Volts, hence the terminal voltage of the battery is 10.5 Volts.How much work w does the battery connected to the 21.0-ohm resistor perform in one minute? Express your answer in joules.

###### FREE Expert Solution

Work done in electric circuits:

$\overline{){\mathbf{W}}{\mathbf{=}}{\mathbf{P}}{\mathbf{t}}}$, where P is power and t is time.

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###### Problem Details

A battery has an EMF of 12.0 volts and internal resistance of 3 ohms A 21.0-ohm resistor is connected to the battery. 0.5 Amps flow through the battery, hence 0.5 Amps flows through the 21.0-ohm resistor The potential difference across the 21.0-ohm resistor is 10.5 Volts, hence the terminal voltage of the battery is 10.5 Volts.

How much work w does the battery connected to the 21.0-ohm resistor perform in one minute? Express your answer in joules.