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Voltmeter and Ammeters
I love chocolate especially at Tuesday, February 2, 2010 | back to top, baby

Voltmeter and Ammeter

Voltmeter-Why parallel?
A voltmeter must be wired in parallel in a circuit in order to measure the difference in EMF from one point to another. Voltmeters must be placed in parallel with the circuit in order to work. This is because voltage meters measure the difference in electromotive force (EMF) from one area to another. They are used to measure the difference in EMF on one side of a component compared to the other side of the component. In our homes, most circuits contain 120 volts of EMF.
http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/parallelcircuit.htm

In analogy with a water circuit, a voltmeter is like a meter designed to measure pressure difference. It is necessary for the voltmeter to have a very high resistance so that it does not have an appreciable affect on the current or voltage associated with the measured circuit.
Ammeter-Why Series?
It must be placed in series with the measured branch, and must have very low resistance to avoid significant alteration of the current it is to measure. The analogy with an in-line flowmeter in a water circuit can help visualize why an ammeter must have a low resistance, and why connecting an ammeter in parallel can damage the meter.

http://hyperphysics.phy-astr.gsu.edu/HBASE/magnetic/movcoil.html