In a half wave rectifier, a p-n junction diode with internal resistance 20 ohm is used. If the load resistance of 2 kiloohm is used in the circuit, then find the efficiency of this half wave rectifier.

A cell of emf 2 V and internal resistance 0.1Ohm is connected to a 20 Ohm resistor .What is the current in the circuit ?

Draw the circuit diagram of a half wave rectifier using a junction diode.

In a common base transistor amplifier, if the input resistance is 200 ohm and load resistance is 20 kiloohm, find power gain. Given current gain of common base trasistor is 0.95

A 220V-50hz a.c. source is connected to an inductance of 0.2 henry and a resistance of 20 ohm in series What is the current in the circuit?

Draw a circuit diagram for use of NPN trnasistor as an amplifier in common emitter configuration. The input resitance of transistor is 1000 Omega . On changing its base current by 10muA , the collector current is increased by 2mA. If the load resistance 5k Omega is used in the circuit, calculate the voltage gain of amplifier.