A cell pushes electrons around a circuit. A battery consists of two or more cells.
A switch enables the current in a circuit to be switched on or off.
A bulb/indicator is designed to emit light as a signal when a current passes through it or as a light source such as a lamp.
A diode allows current through in one direction.
An ammeter is used to measure electric current.
A voltmeter is used to measure potential difference/voltage.
A fuse is designed to melt and therefore break the circuit if the current through it is greater than a certain amount.
A variable resistor allows the current to be varied.
A fixed resistor limits the current in a circuit.
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