![]() It has three terminals we will call them X, Y and Z for the moment. It is sometimes incorrectly attributed to a contraction of transresistance.Ī simple and general form of such a device is shown in figure 8.1.1. The first type of transistor successfully demonstrated was a current-controlled device.Īs a side note: The origin of the term transistor is a contraction of “transconductance varistor”, as Devices working on the principle of one current controlling another current are known as current-controlled devices. Devices utilizing a voltage as the controlling signal are, not surprisingly, called voltage-controlled devices. One type of active device uses a voltage to control the current while another type of active devices uses another current to be the controlling signal. All active devices control the flow of current through them. For a circuit to be called electronic, it must contain at least one active device. ![]() An active device is any type of component with the ability to electrically control the flow of current (controlling one electric signal with another electric signal).
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