This lesson explains you about cells, batteries and circuits.
A battery is a device that makes and stores electricity.
An electrical cell is used to make electricity.
Two or more cells joined together. If a number of cells are joined together, they make a battery.
An Italian *physicist called Alessandro Volta.
*Physicist – A scientist trained in physics
There are chemicals in a battery. When the cell or battery is joined up in a complete circuit, chemical energy in the battery turns into electrical energy and produces an electric current (electricity).
To push electricity around the circuit.
An electrical force is an electrical power or strength.
Volt is the unit used to measure electrical force. The unit has been named after Alessandro Volta (1745-1827).
Voltage is the electrical force produced in a cell or battery, measured in volts.
One and a half volts (1.5 V)
Type of battery
|One cell||1.5 V|
|Two cells||3 V (1.5 V x 2)|
|Three cells||4.5 V (1.5 V x 3)|
|Six cells||9 V (1.5 V x 6)|
A circuit is a path which an electric current takes around a loop of wires and connections.
1) A circuit is a loop with no beginning and no end.
2) Electricity moves or flows around the whole circuit.
3) Electricity flows through the wires, the bulb, the switch and the cell.
When electricity flows around the circuit it makes the light bulb glow.
The cell stores energy.
Energy from the cell is needed to make electricity flow around the circuit. Energy stored in the cell is changed to heat and light in the bulb.
A switch is a way of opening and closing a gap in a circuit.
Switches are easier and safer than touching two wires together or pulling them apart.
Electricity flows through the bulb only when the switch is ‘on’ and the gap in the circuit is closed.
When the switch is off and there is a gap in the circuit.