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There are two ways to measure resistance in an electrical circuit.

Firstly, one can use a voltmeter and an ammeter simultaneously. Take note that the ammeter is to be placed in series with the object of interest while the voltmeter should be placed in parallel to the object of interest. Since R=V/I, simply divide the voltage reading by the current reading and you will obtain the value of resistance in the object of interest in the unit ohm.

The alternative method can only be employed by science organisations and research industries for the equipment required is very advance and expensive. An ohmeter (instrument measuring resistance directly) can be used.

Hope that helps!

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