Watch this video and answer the following questions :

1. Give examples of applications given by the transistors ?

2. What are the two aims of the transistor ?

3. Name the terminals of this component.

4. What happens to the signal applied to the base ?

5. Explain the purpose of the resistance placed in serie with the LED.

6. Human skin is a conductor, why the LED does not light ?

7. How should we connect the transistor to light the diode in the previous circuit ?