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**Electric power** is the energy per unit of time that electrical energy is converted into another form of energy.

Recall the equations **P=IV** and **V=IR** where P is power, I is current, and R is resistance.

Combining these two equations, you can write **P=I ^{2}R**. Describe what this equation can be used for.

How can you calculate the amount of total energy transferred using the above equations?

What is a **killowatt hour** and why is it used by power companies?

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