Measuring Resistance
Physics: Edexcel IGCSE, topic 2.3.3
Measuring Resistance
We calculate the resistance using R = V/I. We calculate potential difference using a voltmeter and current using an ammeter at the same time.
Potential difference across a component
- To measure the resistance of a component (e.g. lamp or resistor), measure the potential difference across the component.
Current through a component
- Use an ammeter to measure the current flowing through a component.
Resistance
- The longer the wire, the higher the resistance
Test yourself on Measuring Resistance
What would you use to measure potential difference across a component?