# Electricity

## Current

Definition

An electric current is a flow of electric charge.

Compare and contrast

Without a current you can't have a voltage, resistance, or power going

Real world example

When you use a wire letting one end touch the battery and the other touch the light bulb it makes the bulb light up and heats.

## Voltage

Definition

An electromotive force or potential difference expressed in volts.

Compare and contrast

Voltage increases with the amount of the current flows.

Real world example

The voltage inside increases when the current is stronger.

## Resistance

Definition

In electricity, a measurement of the difficulty encountered by a power source in forcing electric current through an electrical circuit, and hence the amount of power dissipated in the circuit. Resistance is measured in ohms.

Compare and contrast

The more resistance that you put on a current the less it flows through

Real world example

When you put resistance on a current that is flowing it makes it flow slower

## Power

Definition

power is the rate of doing work. It is equivalent to an amount of energy consumed per unit time.

Compare and Contrast

If you don't have any work then you can't have a current.

Real world example

When your car breaks down in the middle of the road and you have to push it to the side of the road, you are using power.