# Ohm’s Law

## Ohm’s Law

### ZIMSEC O Level Combined Science Notes: Experiment: Ohm’s Law

• It gives the relationship between potential difference and current through a wire in a circuit
• According to the law:
• $\text{potential difference}\propto\text{current}$
• The current passing through a wire is proportional to the potential difference across its ends
• Provided the temperature remains constant
• An equation can thus be formed:
• $constant\dfrac{\text{potential difference(V)}}{\text{current (I)}}$
• Resistance-is the constant
• It is a measure of how difficult it is for a current to flow through the given wire
• It is measured in ohms
• The symbol Ω is used to represent ohms
• Ohms law can be expressed as:
• $\text{R =}\dfrac{V}{I}$
• V is voltage
• I is current
• R resistance
• By substituting the formula the equation can be used to find unknown variables where two of the variables are known

To access more topics go to the Combined Science Notes page.

By |2018-05-03T14:33:27+00:00May 30th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|Comments Off on Ohm’s Law

### About the Author: Garikai Dzoma

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.