**Resistance** is an electrical quantity that measures how a device or material reduces the electrical **current** flow through it.

## What is Resistance?

**Resistance** is an electrical quantity that measures how the device or material reduces the electrical **current** flow through it. **Resistance** is measured in **ohms (Ω)**.If we make a comparison of resistance to water flow in pipes, the **resistance** is greater when the pipe is thinner, so the water flow is decreased It slows down which also happens to the flow of electricity.

## Resistance equation

To calculate** Resistance** we write the equation like this.

$V = { \mathit I \, \mathit R} $

## Resistance demo

In this tutorial you will learn how to calculate the **resistance** in an electrical circuit.

## Chilled practice question

Calculate the** resistance** of a bulb supplied with 8** V ** and a **current** flow of 2 **A**.

## Frozen practice question

Calculate the **current** in a circuit which has a **resistance** of 16 **Ω** and a **potential difference** of 8 **V**.

## Science in context

**Resistance** reduces the flow of electricity.

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