How transistors work
If there is no external voltage is connected to transistor, then there is no current flowing in a circuit, in other words all the electrical current equal to zero. So to use a transistor, we need to link in such a way, to obtain a current flow that we want.
Circuit below is an example of how the NPN transistors work
where:
With these conditions, we can see that:
Circuit below is an example of how the NPN transistors work
where:
- Emitter terminal is a negative polarity
- Collector terminal has a few volts more positive than emitter terminal
- Base terminal is 0.7 Volt more positive (see break down voltage) or greater.
With these conditions, we can see that:
- A relatively small current flows through the base (IB)
- Currents with a much greater value flow through the collector (IC)
- Base current and collector current flowing out of transistor through the emitter.
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