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Receptacle tester. A receptacle tester or outlet tester is a device used to verify that an AC wall outlet is wired properly. The tester itself is small device containing a power plug and several indicator lights.
The Semiconductor Transistor. The modern electronic transistor is a semiconductor device, commonly used to amplify or switch electronic signals. A transistor is made of a solid piece of a semiconductor material, with at least three terminals for connection to an external circuit.A voltage or current applied to one pair of the transistor's terminals, changes the current flowing through another pair of terminals.ransistors are composed of three parts, called a base, a collector, and an emitter. The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply.