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1. LEDs are an example of a semiconductor device.
2. Because electricity cannot pass freely through it.
3. N-type semiconductors have an extra electron, giving it a negative charge. P-type semiconductors have a hole, giving it a positive charge.
4. A diode prevents the electric current from going back and forth, forcing it to only go in one direction. N-type and P-type semiconductors join together to create a diode, where the positive side is the Anode and the negative side is the Cathode.
5. Rectification allows electricity to flow only in one direction.
6. The raw material of the semiconductor is dependent on what color the LED gives off. The color of an LED depends on where on the visible light spectrum that particular color is, for example; the color red is between 620-750 nm.
7. The Collector Current can change significantly in response to a slight change in the Base Current. So it can be adjusted using the Base Current.
8. Because it has no physical contact, a transistor doesn't wear out and is less likely to fail.
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