A transistor type having two PN junctions, configured as NPN or PNP.   May be used as an amplifier or switch.

     The actual power consumed by a circuit; measured in watts. 

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     Current from a power source that changes polarity periodically. 

    A device that supplies alternating current. 

    A standard for wire sizes, with the smallest being designated as forty (40) and the largest as four aught (4/0).

     An instrument used for measuring current.

    The current–carrying capacity of conductors in amperes.

    The amount of electric current in amperes.

    The unit of measurement for current. One ampere is that current whereby one coulomb of charge passes through a point in one second. Named for André Ampere.