ombtom
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Why must ammeters have a low resistance and voltmeters have a high resistance?

Physics ISA (unit 3) in 2 days.

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Puddles the Monkey
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(Original post by ombtom)
Why must ammeters have a low resistance and voltmeters have a high resistance?

Physics ISA (unit 3) in 2 days.

Thanks.
Heya, I'm going to put this in the physics forum for you as you should get more responses there.You should also check out the forum to see if there's any other threads there which might be helpful to you!http://www.thestudentroom.co.uk/forumdisplay.php?f=372
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pleasedtobeatyou
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(Original post by ombtom)
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Think about it. What is the ammeter trying to measure? If additional resistance is introduced into the circuit by an ammeter, which is placed in series, what would happen to the measurement?

For the voltmeter, use Kirchoff's Current Law. If the resistance of the voltmeter was low, then more current will flow through it. What happens to the voltage dropped between two the nodes of the voltmeter then?
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