Answer to Question #102871 in Electric Circuits for Amandeep Singh

Question

The resistance of ammeter is vary high as compared to voltmeter true ,false

Answer 1

Answer: False

A current measuring device should be connected in series with the circuit. As the resistance of the current measuring device will add to the resistance of the circuit, the current measured will be less than the actual current. Thus, an ideal current measuring device (ammeter) should have zero or negligible resistance.

A voltage measuring device is connected in parallel to the circuit. If the resistance of the voltage measuring device is small, a large amount of current will be diverted from the circuit, to flow through the voltage measuring device. Thus the potential difference measured will be small. Thus, a voltage measuring device (voltmeter) should have an infinite resistance so that the current through the circuit does not get deflected to pass through the voltage measuring device.