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Lesson 10: Non-Mechanical Switches
Activity 1: How Non-mechanical Switches Work
How Non-Mechanical Switches (Transistors) Work
You can see in the diagram that two terminals—the source (where current goes in) and the drain (where current goes out)—are negatively charged. They are made of n-type silicon ("n" for negative). Both terminals sit on a positively charged well of silicon connected to the gate terminal. The well silicon is called p-type silicon ("p" for positive). When a charge is applied to the gate terminal, electrons in the p—silicon are drawn to the space between the source and drain terminals and form an electron channel. Electrons now flow from the source to the drain. In this position, the transistor is on. Remove the charge from the gate terminal and the transistor returns to its off state.
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