Listen and answer n°2 on Transistor as a switch
1- Name the 3 terminals of the transistor.
2 - Input voltage vi is a non-alternating rectangular signal with Vimax=6V and Vimin=-2V. Give the mean value of vi.
3 - What is the use of resistance Rb of the circuit ?
4 - The LED lights when vi is equal to 6V. Why ?
5 - The LED does not light when vi is equal to -2V. Why ?
6 - The transistor used in the circuit is a NPN transistor. Name another type of bipolar transistor.
