![]() Therefore, both the on – state and off – state power loss is zero in the transistor switch. When the transistor operating as switch, in the cut off region the current through the transistor is zero and voltage across it is maximum, and in the saturation region the transistor current is maximum and voltage across is zero. ![]() If a positive signal applied at the input terminal then it acts like a closed switch. When a zero input signal applied to the base of the transistor, it acts as an open switch. The transistor operates as a Single Pole Single Throw (SPST) solid state switch. ![]() If the transistor is operated in the saturation region then it acts as closed switch and when it is operated in the cut off region then it behaves as an open switch. A transistor can be used as a solid state switch. ![]()
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