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A variable resistor that changes its resistance with the voltage applied and is used to protect circuits against excessive transient voltages.

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

An electromechanical switch operated by a current-limited control circuit.

A set of electronic circuits on one small plate ('chip') of semiconductor material, normally silicon.

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

Emits light when an electric current passes through it and is used in a wide variety of signaling and illumination applications.

Allows current to flow in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the breakdown voltage known as 'Zener voltage'.

Allows current to flow in one direction but blocks it in the opposite direction, characterized by its forward voltage drop.

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

Generates an electric charge in response to applied mechanical stress and can also apply mechanical stress in response to an electric charge, used in sensors and actuators.

An automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit.

Stores and releases electrical energy in the form of an electric field and is measured in farads (F).

An electronic component that transfers electrical signals between two isolated circuits by using light.

Limits the flow of electrical current in a circuit and has a specified resistance measured in ohms (Ω).

An electronic component that is widely used to switch AC power and can control the flow of current over both halves of an alternating cycle.

A type of resistor whose resistance is dependent on temperature, can be positive or negative temperature coefficient.

Stores and releases energy in the form of a magnetic field when an electric current passes through it, measured in henries (H).

Converts light into an electrical current and is used as a light sensor.

A safety device that protects an electrical circuit from excessive current by melting a wire inside.