Question

The equivalent resistance between the point A and B in the circuit shown in figure, when switch S is closed, is
​

Answer 1

Answer:

Correct option is

B

8Ω

Using the envelope theory , We can open the circuit from center

Let the center be O

R

DC

=

15

1

+

30

1

→R

DC

=10

R

ADCB

=15+15+10=40

R

AOB

=15+15=30

R

AB

1

=

15

1

+

40

1

+

30

1

R

AB

=8

Answer 2

Concept: The equivalent resistance is where the total resistance connected either in parallel or in series. Electrical resistance shows that what proportion energy are needed once we move the fees i.e. current through the circuit.

In natural philosophy, a circuit could be a complete circular path that electricity flows through. a straightforward circuit consists of a current supply, conductors and a load.

Given: R1=6Ω

R2=3Ω

R3=3Ω

R4=6Ω

Find: Calculate equivalent resistance between the point A and B ib the circuit.

Solution: R=R'+R''

R'=R1XR2/R1+R2

  = 6X3/6+3

  = 18/9

  =2Ω

R''=R3XR4/R3+R4

  = 3X6/3+6

  = 18/9

  = 2Ω

R=2Ω+2Ω

 = 4Ω

Final answer: Equivalent resistance between the point A and B in the circuit is 4Ω.

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