Measuring V and I

IB Physics: Measuring V and I

Can we ever measure a quantity without changing it?To verify theory we must do experiments that involve measuring quantities but sometimes those quantities are changed by the act of measurement.In practical fault-finding situations a voltmeter is more commonly used than an ammeter. For example in a line of series resistors the broken one can be found as its the one with a pd across it equal to the source pd.

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