![]() In simple terms the smaller current switches on the larger one. The transistor does this by taking a small current through one part and taking a much larger current through the other side of it. The second job a transistor could do is act as an on/off switch. When a transistor is used like this you can think of it as a current booster device. ![]() In electronics this would be a small input current, the transistor would then produce a much larger output current at the other end. An amplifier is a device that takes something small on the input side and then produces something much larger. The first thing a transistor can be is an amplifier. They normally have three terminals that are used to connect a supply or circuit. They are most of the basic blocks of electronics. Transistors are small electronic components that can do two different jobs.
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