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Transfers electrical energy between two or more circuits through electromagnetic induction.

A device for making, breaking, or changing the connections in an electrical circuit.

A set of electronic circuits on one small flat piece (or 'chip') of semiconductor material.

A resistor with a variable (adjustable) resistance.

Amplifies or switches electronic signals.

Limits the flow of electric current in a circuit.

Stores energy in an electric field between its plates.

Allows current to flow in one direction only, acting as a one-way valve.

An electrically operated switch using an electromagnet to mechanically operate a circuit switch.

A safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds a safe level.

A semiconductor light source that emits light when current flows through it.