the electricity from electric sockets and circuits in a home

a brown wire in a mains circuit that has a voltage of ±230 V

a blue wire in a mains circuit that has a voltage of 0 V

a current passing through a person’s body that can be painful and sometimes harmful

a property of materials that makes it harder for current to flow

Danger from electric shock

Physics

In the Circuit components unit, pupils learnt how the resistance of filament lamps and diodes change with current and about the properties and applications of light dependent resistors and thermistors.

Mains electricity

a complete circuit with a very small resistance, often caused by a loose wire

two layers of electrical insulation, including the outer casing of an appliance

a thin wire that melts when a dangerously large current flows through it

a wire connected between a metal casing and the ground (0 V)

a switch that is turned off by an electromagnet when a dangerously large current flows through it

Short circuits and earth wires

the amount of energy transferred each second

the unit of power; equal to the number of joules of energy transferred each second

a unit of power; 1 kilowatt is equal to 1000 watts

Power of an appliance or electric circuit

an electrical property; it can either be positive or negative

the amount of electric charge flowing past a point in a circuit each second

the amount of energy transferred by each coulomb of charge, passing between two points in a circuit

Calculating with electric charge: including complex calculations

a high voltage transmission system for getting electricity to where it is needed

a high voltage cable often seen between electricity pylons

a device that can change lower alternating voltages to higher ones

a device that can change higher alternating voltages to lower ones

the transfer of energy into the surroundings by heating

The National Grid

a coil of insulated wire in a transformer, across which potential difference is applied

a coil of insulated wire in a transformer, across which potential difference is induced

pure iron inside the coil of an electromagnet that loses all of its magnetism when the electromagnet turns off

the p.d. across a conductor caused by a magnetic field moving relative to it

the proportion or percentage of energy supplied to a device that is transferred in a useful way

Transformers

an energy resource that can be replenished as it is used

an energy source that cannot be replenished as it is used

coal made from fossilised plants, or oil and natural gas made from tiny fossilised sea creatures

using energy so that in the future there will be enough for people's needs

Mains electricity

Choose a lesson (7)

Some of these lessons will soon be taken down.