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, Alternating Current (AC) A flow of electric charge that regularly reverses its direction.
Ammeter A device used to measure current in a circuit
Circuit breaker a switch that opens when the current in a circuit is too high
Circuit diagram A diagram with symbols that shows all of the components in a circuit and how they
are connected.
Components the parts of a circuit (light globes, switches, resistors, wires, globes and batteries)
Conductor A material that allows a current to pass
Current The flow of charge
Ω Ohms
Ohms unit for resistance
Direct current (DC) Electrically charged particles flowing in one direction only
Dry cell a compact cell that uses a paste as an electrolyte
Dynamo A small generator that spins its magnet instead of its coils