Question

Calculate the equivalent resistance between the points A and B for the following combination of resistors : 

Answer 1

 

Resistance of three 4Ω resistors in series = 4 × 3 = 12Ω 

Resistance of three 2Ω resistors in series = 2 × 3 = 6Ω 

∴ Equivalent resistance of 12Ω, 6Ω and 4Ω in parallel. 

1/R_p = 1/12 + 1/6 + 1/4 = 1 + 2 + 3/12 = 1/2 ⇒ R_p = 2Ω 

Equivalent resistance of 5Ω, 2Ω and 6Ω in series. 

R = (5 + 2 + 6) 0 = 13Ω