Question

Calculate the effective resistance between the points A and B in the circuit shown in Figure.

 

Answer 1

 

In the figure above,
Resistance between XAY = (1 + 1 + 1) = 3Ω
Resistance between XY = 2Ω
Resistance between XBY = 6Ω
Let ' R be the net resistance between points X and Y 

Then, `1/R=1/2+1/3+1/6`

= `(3+2+1)/6`

= `6/6Ω` 

Or, RI = 1Ω 

Thus, we can say that between points A and B,
Three 1 Ω resistors are connected in series.
Let RAB be the net resistance between points A and B. 

Then, RAB = (1 + 1 + 1) Ω = 3Ω