To measure resistance by the ammeter-voltmeter method

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To measure resistance by the ammeter-voltmeter method

For this method we require a voltmeter of very high resistance and an ammeter of very low resistance. The unknown resistor, R, is connected in series with an ammeter, a rheostat, a plug key or other switch, and one or more cells. The voltmeter is connected across the ends of R (Fig. 40.4 (a)). As a safety precaution to avoid damage to the ammeter.

To measure resistance by the ammeter-voltmeter method

To measure resistance by the ammeter-voltmeter method

 

 

 

 

 

 

 

through overload, the rheostat should be set to maximum resistance, before closing the circuit. The rheostat is then altered to give a series of suitable ammeter and voltmeter readings.

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The results may be entered in a table as below and a mean value for R calculated

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To measure resistance by the ammeter-voltmeter method