Physics › Section O · Current and circuits › Topic O.8
Voltmeters, ammeters, and null measurements
Every measurement of a circuit slightly changes the circuit being measured. Knowing how meters are built and connected tells you how big that change is, and null methods show how to make it vanish.
In this topic
- Measuring changes what you measure
- Ammeters and voltmeters
- The galvanometer
- Worked example: building a voltmeter
- Worked example: building an ammeter
- Worked example: a voltmeter that loads the circuit
- The idea of a null measurement
- The potentiometer
- Worked example: a Wheatstone bridge
- Common mistakes to avoid
- Key takeaways
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