Question

State the law of combination of resistances in parallel.

Answer 1

Answer:

Consider three resistances R1 , R2 & R3 connected in parallel combination with a power supply of voltage V.

Now

I = I1 + I2 + I3

according to Ohm’s law

V/R = I

Therefore,

V/Re = V/R1 + V/R2 + V/R3

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

V/ReV = 1/R1 + 1/R2 + 1/R3

OR

For latest information , free computer

Answer 2

$\frac {1}{R_{Resultant}} = \frac {1}{R_1} + \frac {1}{R_2} + \frac {1}{R_3} + ...$ is what it states

Explanation:

• Let us consider three resistances $R_1, R_2, R_3$ connected in a parallel combination.

• As per the Ohm's Law,

When V is the Voltage, I is the current applied and R is the resistance of any circuit, then  

V = IR  

or  

$R = \frac {V}{I}$

• The Resistances of the resistors in parallel are the sum of reciprocals of their individual resistances in parallel connection, as per law of combination of resistances.

$\frac {1}{R_{Resultant}} = \frac {1}{R_1} + \frac {1}{R_2} + \frac {1}{R_3} + ...$