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- Figure 20A is a photo of a diode that is a solid-state component that combines an n-type and p-type semiconductor. When voltage is applied, electrons flow from the n-type to p-type semiconductor. A diode can change alternating current to direct current.
- Figure 20B is a photo of a transistor, a solid state component with three layers of semiconductors. A transistor can act as a switch or as an amplifier
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