Sources of Electricity
Friction causes electricity. However, it does not supply the electricity needed to power appliances. An electric current is a continuous, one-directional flow of electricity.
Below are some different sources of electricity.
A battery can supply electricity. A battery is also called a dry cell. Dry cells are made up of a dry acid paste enclosed by metal plates, usually made of copper and zinc, with a carbon rod at the center. The acid paste reacts chemically with the metal plates. This reaction produces electricity. The electrons then flow through the carbon rod. In order for these electrons to leave the battery, a pushing force is needed. The strength of this push that makes electrons move is called voltage. Different batteries have different voltages. The higher the voltage, the greater the push that forces electrons to flow.
