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A coil of wire that creates a magnetic field when current flows through it and opposes changes in the current.

A device that transfers electrical energy between two or more circuits through electromagnetic induction.

A safety device that stops the flow of current when the current exceeds a certain level.

A three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.

A type of capacitor with a larger capacitance per unit volume than other types, which uses an electrolyte as one of its plates to achieve a larger capacitance.

A device that opposes the flow of electrical current.

A reference point in an electrical circuit from which voltages are measured, a common return path for current, or a direct physical connection to the Earth.

A device that allows current to flow in only one direction.

Similar to NPN but with opposite semiconductor type, allowing current to flow when low base current is applied.

An electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal to create an electrical signal with a precise frequency.

A device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator.

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

A resistor whose resistance can be adjusted manually.

Single Pole Single Throw switch, controls the connection of a circuit to one path.

A two-terminal electronic device that delivers or absorbs an electric current which is independent of the voltage across it.

Light Emitting Diode, a semiconductor device that emits light when current flows through it.

A two-terminal device that maintains a fixed voltage across its terminals.

A semiconductor device used to amplify or switch electronic signals and electrical power.

High-gain voltage amplifier with a differential input and usually a single-ended output.