Electrical power

What is Electrical power?

The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The unit for power is the watt, which is the transfer of one joule per second. Electric power can be produced by electric generators and batteries.

Electrical power equation

To calculate Electrical power we write the equation like this.

$ {\mathit P \, \text = \mathit I \mathit t}$

Electrical power demo

In this tutorial you will learn how to calculate the electrical power of different electrical appliances.

Chilled practice question

Calculate the power in a circuit which has a p.d of 18 V and current of 4 A.

Frozen practice question

Find the current flowing through an appliance which has a power rating of 14 KW and a p.d of 230 V.

Science in context

The power of an appliance is the energy that is transferred per second

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