Question

derive expression for parallel combination of resistors​

Answer 1

Answer:

Important results about parallel combination :

i.e. V1 = V2 = V3 = V : (iii) (iii) Current flowing through each resistor is inversely proportional to its resistances, thus higher the resistance of a resistors, lower will be the current flowing through it.

Answer 2

Answer:

In parallel combination, each resistor'sone is connected to the positive terminal while the other end is connected to a negative terminal. The potential difference across each resistance is the same and the current passing through them is different.

V = V1 =V2=V3

I = I1+ I2+I3

Current throught each resistor will be:

I1= V/R1 , I2 = V/R2 = I3 = V/R3

I = V (1/R1+ 1/R2+1/R3)

In case of equivalent resistance I=V/Re

V/Re = V (1/R1+ 1/R2+1/R3)

So the equivalnet resistance is the sum of all resistance.

1/Re = 1/R1+ 1/R2+1/R3

hope it helps you......