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CBSE Class 10 Answered

why is a voltmetre connected in parallel and not in series ? whereas ammetre in series not in parallel
Asked by Arushi Vashist | 16 Jul, 2010, 08:01: PM
answered-by-expert Expert Answer
Hello,
An Ammeter is used to measure the amount of current flowing through a wire/circuit. The deflection is directly proportional to the amount of current passing through it, So we need to pass  all the required current through the meter, which can be possible by series connection.
A voltmeter measures voltage difference between two points. If current passes through voltmeter then there will be certain amount of voltage drop across the voltmeter also and this will decrease the accuracy and will give wrong result. Voltmeter is connected in parallel with a very high resistance, so that a very less amount of current flows through it and maximum current flows through the wire/circuit.
An ideal voltmeter has infinite resistance.
Regards,
Topper learning
Answered by | 16 Jul, 2010, 10:35: PM

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