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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.
Types of Transistors: The photo above depicts an IGBT Transistor from Powerex. 1  Bipolar Transistor-A Bipolar Junction Transistor (BJT) is a three-terminal electronic device made of doped semiconductor material and may be used in amplifying or switching applications.ypes of Transistors-Transistor Applications, Transistor Construction. Transistors are a three terminal semiconductor device used to regulate current, or to amplify an input signal into a greater output signal. Transistors are also used to switch electronic signals.