The resistor is a basic electrical component which offers resistance to the external circuit. There are two basic configurations of resistors:

- Series Configuration
- Parallel Configuration

## Series Configuration

In series configuration head of one component joins the tail of another and there is no third connection in between them. The image is shown below:

In a series configuration, the equivalent resistance (Requivalent) is equal to the sum of individual resistors.

For example here:

R_{equivalent} = R_{1} + R_{2} + R_{3}

If,

R_{1 }= 5 ohm

R_{2 }= 10 ohm

R_{3 }= 15 ohm

Then R_{equivalent} = 30 ohm

## Parallel Configuration

The second configuration (being parallel) is a little bit complicated. Two or more components of in parallel if their heads share a single node and tails share another node.

For parallel configuration the formula used is:

1/R_{equivalent} = 1/R_{1} + 1/R_{2}

Since this is the somewhat difficult formula you need some practice memorising it. If you have online access there is an easy solution here for solving parallel resistors.

Example for a parallel circuit,

If, R_{1 }= 5 ohm

and R _{2}= 5 ohm

then

1/ Requivalent= 1/R_{1 }+ 1/R2.

and R_{equivalent }= 2.5 ohms

So that was all about these two configurations. Hope you liked the tutorial. Inform me in comments about your views.