# Ammeter

## Key Stage 3

### Meaning

A picture showing an analogue ammeter.

An ammeter is a measuring device used to measure electrical current.

Ammeters are added in series to a circuit to find the current flowing through the circuit.
An ideal ammeter has zero resistance because otherwise adding an ammeter to a circuit would change the current.
Ammeters can be analogue with a needle pointing to numbers on a dial or it can be digital with a number display.
 An ammeter placed in series with a bulb.

## Key Stage 4

### Meaning

An ammeter is a measuring device used to measure electrical current.

Ammeters are added in series to a circuit to find the current flowing through the circuit.
An ideal ammeter has zero resistance because otherwise adding an ammeter to a circuit would change the current.
Ammeters can be analogue with a needle pointing to numbers on a dial or it can be digital with a number display.
 To measure the current through bulb 1 the ammeter can be placed anywhere in this series circuit. To measure the current through bulb 2 the ammeter can be placed anywhere in this series circuit.
 To measure the current through bulb 1 the ammeter must be placed in series with bulb 1. To measure the current through bulb 2 the ammeter must be placed in series with bulb 2.

### References

#### AQA

Ammeter, pages 52-6, GCSE Physics; Student Book, Collins, AQA'
Ammeters, page 41, GCSE Physics, Hodder, AQA'
Ammeters, page 52, GCSE Physics; Third Edition, Oxford University Press, AQA'
Ammeters, pages 180, 239, GCSE Combined Science; The Revision Guide, CGP, AQA'
Ammeters, pages 25, 106, GCSE Physics; The Revision Guide, CGP, AQA'
Ammeters, pages 293, 296, GCSE Combined Science Trilogy 1, Hodder, AQA'
Ammeters, pages 60, 61, 235, GCSE Combined Science Trilogy; Physics, CGP, AQA'
Ammeters, pages 62, 63, 331, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA'
Ammeters; circuit symbol, page 38, GCSE Physics, Hodder, AQA'

#### Edexcel

Ammeters, page 142, GCSE Physics, Pearson Edexcel
Ammeters, page 382, GCSE Combined Science, Pearson Edexcel
Ammeters, pages 186, 210, GCSE Combined Science; The Revision Guide, CGP, Edexcel
Ammeters, pages 220, 338, GCSE Physics, CGP, Edexcel
Ammeters, pages 73, 106, GCSE Physics; The Revision Guide, CGP, Edexcel

#### OCR

Ammeters, pages 102-103, 259, Gateway GCSE Physics, Oxford, OCR
Ammeters, pages 178, 224, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
Ammeters, pages 45, 49, 105, Gateway GCSE Physics; The Revision Guide, CGP, OCR