# Resistances and are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.A. Both and are closed.B. Both and are open.C. is closed but is open

A. When both S1 and S2 are closed, R4 is short circuited.

R3 and (R1||R2) are in series

Effective resistance of the circuit Reffective =

Let the applied voltage be V.

Current in the circuit

B. When both S1 and S2 are open, R3 , R1 and R4 are in series.

The effective resistance of the circuit,

Reffective = R3 + R1 + R4

Let the applied voltage be V.

Current in the circuit I = V/Reffective

C. When S1 is closedbut S2 is open, R3, (R1||R2) and R4 are in series.

As S1 is closed, R1 and R2 are parallel to each other.

The effective resistance of the circuit is

Reffective = R3 + (R1||R2) + R4 ( When R1||R2 )

=

Let the applied voltage be V

Current in the circuit I = V/Reffective

I =

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RELATED QUESTIONS :

Umesh has two bulbs having resistances of and He wants to connect them in a circuit, but if he connects them one at a time the filament gets burnt. Answer the following.

A. Which method should he use to connect the bulbs?

B. What are the characteristics of this way of connecting the bulbs depending on the answer of A above?

C. What will be the effective resistance in the above circuit?

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