Current Division

Current Division:

In a parallel circuit, the Current Division in all branches. Thus, a parallel circuit acts as a current divider. The total current entering into the parallel branches is divided into the branches currents according to the resistance values. The branch having higher resistance allows lesser current, and the branch with lower resistance allows more current. Let us find the current division in the parallel circuit shown in Fig. 1.32.

Current Division

The voltage applied across each resistor is Vs. The current passing through each resistor is given by

Current Division

If RT is the total resistance, which is given by R1R2/(R1+R2),

Total currentCurrent Division

Current Division

 

Similarly,Current Division

From the above equations, we can conclude that the current in any branch is equal to the ratio of the opposite branch resistance to the total resistance value, multiplied by the total current in the circuit. In general, if the circuit consists of m branches, the current in any branch can be determined by

 

Current Division

where

Irepresents the current in the ith branch

Ri is the resistance in the ith branch

RT is the total parallel resistance to the ith branch and

Iis the total current entering the circuit.

Power in a Parallel Circuit:

The total power supplied by the source in any parallel resistive circuit is equal to the sum of the powers in each resistor in parallel, i.e.

Current Division

where m is the number of resistors in parallel,Ps is the total power and Pm is the power in the last resistor.