![]() So, current at collector terminal is 7.1mA This corresponds that the collector output is observed by modifying the input voltage values which are 0 and 5V. At the base edge, a signal that varies between 0 and 5V is applied. To be clear of this switching method, let us consider an example.Īssume that a transistor has a base resistance value of 50kOhm, the resistance at the collector edge is 0.7kOhm and the applied voltage is of 5V and considers beta value as 150. So, when the transistor moves into the ‘ON’ condition, there will be a flow of current from the source terminal to the ground via load. In this switching method, the connected load in contact with the switching point where this acts as a reference point. In the same way, when there is no voltage applied at the input terminal, then the transistor functions in the cut-off region and functions as an open circuit. So, the transistor in this condition performs as a switch and the current that flows through the collector is considered as the transistor current. When there is a good amount of voltage which is ~0.7V in between the emitter and the base edges, then the flow of voltage at the collector to emitter edge is zero. In addition, the working of transistor as a switch can be explained in detail as below: Transistor as a Switch – NPNĭepending on the applied voltage value at the base edge of the transistor, switching functionality takes place.
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