Question

give an expression to derive resistance in parallel and series​

Answer 1

Answer:

1.Let I1, I2 and I3 be the currents flowing through R1, R2 and R3 resistors respectively.

2.Hence, we can write I = I1 + I2 + I3.

3.According to the Ohm's law.

4.Here Req is the equivalent resistance.

∴ The equivalent resistance of a parallel combination is less than the resistance of each of the resistors.