fusion_title size=”3″ content_align=”left” style_type=”default” sep_color=”” margin_top=”” margin_bottom=”” class=”” id=””]ZIMSEC O Level Combined Science Notes: Resistors in parallel and in series [/fusion_title]

Resistance in a series can be changed by placing more or less resistors in a circuit

The total resistance of resistors depends in the way in which they are arranged in the circuit

Resistors can be put in series or in parallel

Resistors in series

Resistors in series

In a series circuit the current only has a single path to follow

When they are placed in series the total resistance is equal to the sum of the individual resistances

The formula to find resistance is thus:

R_{total}=R_{1}+R_{2}+R_{3}+…R_{x}

For example if there are two resistors in series each with a resistance of 3 ohms

The total resistance would be:

3+3

6 Ohms

Resistors in parallel

Resistors in parallel

In a parallel circuit there is more than one path for current to follow

The most circuit will flow through the path with the least resistance

If resistors are connected in parallel each one will take some of the current

The total resistance is lowered because there is alternative routes for the current to follow

The total resistance of two resistors in parallel can be found using the formula:

He holds an Honours in Accountancy degree from the University of Zimbabwe. He is passionate about technology and its practical application in today's world.