The current flowing through forward biased diode is 20 mA. The emf of the cell is 3V and the knee voltage is 0.7V. Find the value of wattage R and power consumed across the diode.

Draw diagrams to show how a p-n junction is forward biased Draw V-I characteristics of the diode in both conditions and show in it break down voltage. Mention one important use of Zener diode.

When a 12V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

In a transistor, the base current is changed by 20muA . This results in a change of 0.02V in base emitter voltage and a change of 2mA in the collector current. .If the transistor is used as an amplifier with load resistance of 5KΩ .Find its voltage gain.

A pn junction diode when forward biased has a drop of 0.5 V and independent of current flowing trhough it. The maximum bearable current is 10 mA. Calculate the value of R so the current through the circuit is 5 mA.