Difference between revisions of "Ammeter"

Revision as of 13:03, 25 February 2019

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.

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.

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-|[[File:CircuitDiagramBatteryBulbBulbParallel.png|center|200px]]
+|[[File:CircuitDiagramBatteryBulbBulbParallel2.png|center|200px]]
-|[[File:CircuitDiagramBatteryBulbBulbParallel.png|center|200px]]
+|[[File:CircuitDiagramBatteryBulbBulbParallel2.png|center|200px]]
 |-
 | style="height:20px; width:200px; text-align:center;" |To [[measure]] the [[Electrical Current|current]] through bulb 1 the [[ammeter]] must be placed in [[Series Circuit|series]] with bulb 1.