# Video- Ohm’s Law-Voltage, Current and Resistors in Series Circuit

by on November 17, 2011

Resistors in series. This video from Dunwoody College will help you understand about Ohm’s Law how to make calculations for a series circuit when you’re given the Voltage, Current and Resistance values.

This is Ohm’s Law:

V= IxR  or  I=V/R  or R=V/I

Ohm’s Law deals in the relationship between Voltage (V or E), Current (I) and resistance (R).

When you know 2 of the parameters helps you find the 3rd missing one.

For example, if you know current and resistance you can find out the voltage.

Rules For A Series Circuit
Current is always constant and doesn’t change.
Resistance is always constant and doesn’t change.
Voltage drops as it passes across the resistors but for calculating the current you use the voltage given at the source. You can calculate the voltage drop across each resistor by using Ohm’s Law again at each point when you know the total current.

A Series circuit

This is resistances in series.
In the video example the resistors are in series, which means they are connected one after the other. In a series circuit the resistors can be added together to find the total resistance.  R1+R2+R3 = Total resistance.

To find the total current simply take the source voltage and divide it by the total resistance in the circuit.

I = V / R

Find out about Ohm’s Law calculations in a Parallel Circuit.

ElectriciansBlog.co.uk

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