Question

Draw circuit diagram showing the combination of three resistors R1,R2 and R3
in (i) Series (ii) Parallel. Derive the equivalent resistance in each case.

Answer 1

Answer:

i)series 1ST IMAGE

V=IR => V1=1R1

             V2=IR2

             V3=1R3

V=V1+V2+V3

IR=IR1+IR2+IR3

R=R1+R2+R3

ii)Parallel 2ND IMAGE WITHOUT WRITINGS

I1 = V/R1, I2 = V/R2 and I3 = V/R3 Let their equivalent resistance be Rp then V = I Rp ⇒ I = V/Rp

V/Rp=V/R1+V/R2+V/R3

Explanation: