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Ammeter and voltmeter

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Size:  514.0 KBCan someone please explain this question to me please:

    A voltmeter is in parallel with a component. Normally they have infinite resistance so should have no effect on a circuit, however if it has a low resistance it acts as a resistor in parallel. It can be hard to determine the resistance of the voltmeter in parallel with a component since you do not know the voltmeters resistance and probably won't know (not sure for this, can a later person confirm) what the total resistance of them in parallel is. However the ammeter is in series and you can easily find its resistance by current and the pd across it. So really the ammeter acts as another component in series so you can easily compensate for it, the voltmeter is much more difficult because it will be harder to calculate the new total resistance of them in parallel.

    This this with a circuit setup of the following order: battery > ammeter > variable resistor > battery at start, with a voltmeter in parallel with variable resistor?
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