Home » Current Divider Rule
Electronic Devices & Circuits

Current Divider Rule

It can be quite useful to determine how a current entering two parallel resistors “divides” between them.

Consider the circuit shown below:

Current Divider Rule

We replace the parallel connection of R1   and R2  by its equivalent resistance.

Thus, Ohm’s Law gives:

current-divider-rule-equation

By application of Ohm’s Law again, the current in R1  is i1  = v R1 and thus:

current-divider-rule-formula

Similarly, the current in R2 is :

current-divider-rule-formula-new

These equations describe how the current is divided between the resistors. Because of this, a pair of resistors in parallel is often called a current divider. Note that a larger amount of current will exist in the smaller resistor – thus current tends to take the path of least resistance!

Example:

We want to find the current i in the circuit below:

current-divider-rule-circuit

The total current delivered by the source is:

current-divider-rule-equation-2

Therefore the desired current is:

current-divider-rule-equation-3

Share With Your Friends

Related Articles

Transistor Emitter Bias

S Bharadwaj Reddy

Full Wave Rectifier

S Bharadwaj Reddy

Varactor Diode Operation

S Bharadwaj Reddy

Resistors Principle & Applications

S Bharadwaj Reddy

Half Wave Voltage Doubler using Diodes

S Bharadwaj Reddy

Electronic Symbols

S Bharadwaj Reddy

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

Current Divider Rule

WordPress Image Lightbox
Send this to a friend