Question

if resistance R1 and R2 are connected in parallel combination ,then write formula for effective resistance of parallel combination​

Answer 1

Explanation:

Two ways:

1.R = (R1 x R2) / (R1 + R2)

2.R = 1 / (1/R1 + 1/R2)

On a calculator: input R1, press 1/x, then press +, input R2, press 1/x, press =, then 1/x.

If you have more resistors of various values in parallel, just continue inputting their values and pressing 1/x after each, and press = when you got all of them, and then 1/x. Very simple, and fairly fast.