Which one has lowest resistance, ammeter...

Which one has lowest resistance, ammeter, voltmeter and galvanometer? Explain.

Text Solution

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Ammeter has the lowest resistance. A galvanometer is converted into an ammeter by using a suitable low resistance shunt in parallel with the galvanometer. The effective resistance of the network when resistors are connected in parallel becomes less than the individual resistance. Hence resistance of ammeter is less than that of galvanometer.
Voltmeter is formbed by connecting a suitable high resistance in series with the galvanometer. Since the effective resistance of the net-work increases when the resistors are connected in series, hence the resistance of voltmeter is more than that of galvanometer.

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Which of the following resistances must be used to convert galvanometer into voltmeter for maximum sensitiveness ?

` 1Omega`

`10^2Omega`

`10^5 Omega`

`10^7 Omega`

Assertion : An ammeter is always connected in series whereas a voltmeter is connected in parallel. Reason : An ammeter is a low-resistance galvanometer while a voltmeter is high resistance galvanometer.

Assertion is True, Reason is True, Reason is a correct explanation for Assertion

Assertion is True, Reason is True, Reason is not a correct explanation for Assertion

Assertion is True, Reason is False

Assertion is False, Reason is True

If G, r_A and r_V denote the internal resistances of a galvanometer, an ammeter and a voltmeter among the following the correct relationship is

`G lt r_A lt r_V `

`r_A lt r_V lt G`

`r_A lt G lt r_V`

`r_V lt r_A lt G`