Why we will use high resistance voltmeter in measurements and low voltmeters in networks?
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An ammeter is an instrument for measuring the electric current in amperes in a branch of an electric circuit. 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. By contrast, an voltmeter must be connected in parallel.
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Why does a voltmeter have a high resistance? A voltage measuring device is connected in parallel to the circuit. If the resistance of the voltage measuring device is small, a large amount of current will be diverted from the circuit, to flow through the voltage measuring device.
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