CBSE Class 10 Answered
What is the resistance of volmeter and ammeter?
Asked by Apoorva rai | 17 Jul, 2010, 08:22: PM
Expert Answer
Hello,
The resistance of an ideal voltmeter is infinite.
Voltmeter is connected in parallel and current should not flow from the volmeter so that current in the main circuit does not decreases preventing any voltage drop or inaccuracy in the measurement.
Infinite resistance makes sure zero current through voltmeter. Infinite resistance can not be achieved in reality, though in real life voltmeters have very high resistances.
Ideal ammeter has zero resistance.
Beacause ammeter is connected in series, finite resistance will change the current in the ciruit and hence decreasing accuracy. In real life, ammeters uses shunt, having very low resistances.
Regards,
topperlearning
Answered by | 18 Jul, 2010, 06:24: PM
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