The quantity **power** is the rate at which work is done. The quicker work is done the greater the **power**.

## What is Power?

The quantity **power **is the rate at which work is done. The quicker work is done the greater the** power**. The standard metric unit of **power** is the **Watt**. The calculation of **power** is the **work done** in **Joules** divided by a unit of time **seconds**. 1 **Watt** is equivalent to 1 **joule** of **work done** per **second**. Many machines have their power rating displayed upon them in **Watts**, the higher the value the greater the **powe**r of the machine and the faster the rate of** energy transfer**.

## Power equation

To calculate **Power **we write the equation like this.

$P = { W \over \text{t}} = { E \over \text{t}}$

## Power demo

In this tutorial you will learn how to calculate **power**, the rate of doing work during an **energy transfer**.

## Chilled practice question

Calculate the** power** of an electric fire if it transfers 950 **KJ** of energy in 5 **minutes** 30 **seconds**.

## Frozen practice question

An electric heater has a **power** rating of 2200 **W**. How long to the nearest **second** does it take to transfer 500 **KJ** of **energy**.

## Science in context

**Power** is the rate of **energy transfer** per **second**.

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