OML Search


Related Topics:
More Lessons for IGCSE Physics
Math Worksheets

A series of free GCSE/IGCSE Physics Notes and Lessons.


In this lesson, we will
• Describe what is meant by a resistance.
• Calculate resistance in a circuit.

An electric current is a flow of electrons through a conductor such as a metal wire. As they move, electrons collide with atoms in the metal. Electrical energy is transferred into other forms e.g. thermal. The resistance tells us the potential difference required to drive a current through a component. The resistance of an electrical component can be found by measuring the electric current flowing through it and the potential difference across it.

The following diagram gives the formula for resistance, voltage and current. Scroll down the page for more examples and solutions on how to use the formula.

Resistance Voltage Current Formula

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

OML Search

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.

[?] Subscribe To This Site

follow us in feedly
Add to My Yahoo!
Add to My MSN
Subscribe with Bloglines