![]() ![]() ![]() To make it less of a hassle, we can insert a toggle switch in the circuit so that we can just toggle the lever of the toggle switch if we want to turn ON or OFF the light bulb, instead of connecting or disconnecting the electrical plug. So to turn ON the light bulb, we’ll insert the electrical plug to the outlet and to turn it off, we’ll disconnect the plug from the outlet. I hope you can imagine it, in reality, the light bulb is connected to the AC mains or wall outlet through an electrical plug and zip-cord. In figure 3, we can see a schematic diagram of a light bulb connected directly to the AC mains. So basically, an SPST toggle switch is simply an ON-OFF switch with two terminals (A & B) that can be connected together or disconnected from each other by toggling the lever (actuator). An SPST switch has one pole and one throw, so it can only control one circuit and its pole can be connected to one terminal only. The number of poles in a switch determines how many separate circuits the switch can control while the throw-count of a switch tells us how many positions each of the switch’s poles can be connected to. Before transistors came into existence vacuum tubes were used. The switching path can be controlled very. I understand it intuitively but I don't know how to actually explain these graphs. Instead of that it is operated by a human like a mechanical switch, it is controlled by an electrical signal. In figure 2, you can see a single-pole, single-throw (SPST) toggle switch and the circuit symbol of an SPST switch. The transistor (BJT) was not the first three terminal devices. How does BJT act as a switch and as an inverted switch Ask Question Asked 3 years, 11 months ago Modified 3 years, 11 months ago Viewed 397 times -1 These were the graphs shown for the functioning of BJT as a switch. ![]() A switch is an electrical or electronic device that can open or close a circuit, stopping or allowing the flow of current in a circuit. ![]()
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