Under what condition a transistor works as an open switch?

Under what condition does a junction diode work as open switch?

Transistors can work as a switch in

Transistors can work as a switch in

Draw a circuit diagram of n-p transistor amplifier in CE configuration. Under what condition does the transistor acts as an amplifier?

In which regions of transfer characteristic does a transistor work as a switch?

Draw a circuit diagram of n-p-n transistor amplifier in CE configuration. Under what condition does the transistor act as an amplifier.

In which condition a p-n junction diode works as open switch ?

A transistor act as an open switch when it is in:

Under what conditions is work said to be done?