Question

29. A voltmeter has a resistance of G ohms an
range V volts. The value of resistance
quired in series to convert it into voltmeter
of range nV is ...
(ii) G
(i) nG
G
(iii) n-1
(iv) (n − 1) G​

Answer 1

Answer:

i)) ng is the answer.

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Answer 2

The resistance required to convert it into voltmeter is:

(iv) (n − 1) G​

• The value of resistance can be calculated as follows:

• I = V / G , where I is the current, V is the voltage range and G is the resistance.

• For the potential difference V, the voltmeter gives the full-scale deflection.

• Also, V = n V

• The resistance required (R) = ( n V / I ) - G

                                               R  = ( n V / (V / G) ) - G   =   ( n - 1 ) G   ( as I = V/G)

                                             

• Thus, the resistance required is ( n - 1 ) G to convert it into voltmeter of range nV.