Electric Circuits Answers

Draw the circuit of full wave bridge rectifier with capacitor filter. How does the
capacitor help in reducing ripple in the rectified signal? What is the effect of load
resistance value on this ripple?

Draw the circuit of phase shift oscillator using n-p-n transistor. Explain how
positive feedback is achieved in this circuit.

Describe the working of push-pull amplifier and explain why its operation is highly
efficient?

Why is it necessary in the case of cascade amplifier to use coupling network between
the two stages? What are the advantages of transformer coupling? Why is it not
preferred at low frequencies?

Describe the construction of Junction Field Effect Transistor and explain why it is
called a voltage controlled device.

Design a half adder using only NAND gates.

The Wheatstone bridge. The circuit shown in Fig. P26.81. called a wheatstone bridge, is used to determine the value of an unknown resistor X by comparison with three resistor M,N, and P whose resistances can be varied. For each setting, the resistance of each resistor is precisely known. With Switches K1 and K2 closed, these resistors are varied until the current in the galvanometer G is zero; the bridge is then said to be balanced. Show that under this condition the unknown resistance is given by X=MP/N. (This method permits very high precision in comparing resistors.) If the galvanometer G shows zero deflection when M=850.0 ohms, N=15.00 ohms and P=33.48 ohms, what is the unknown resistance X?

a potentiometer of wire length 1.0m has a resistance of 15ohms .it is connected to a 5volt battery in series with a resistance of 5ohms .determine the emf of the primary cell which gives a balance point at 60cm.

A 3 ohm resistor and a 6 ohm resistor are connected in series across the 3 ohm resistor is 4 volts, what is the voltage supply?

Why don't some ceiling lights not have an earth wire?