Question

a galvanometer with a coil of resistance 12ohm shows full scale deflection for a current of 2.5 mA . How will you convert it into a Voltmeter of range 7.5V ? Also find the total resistance of voltmeter formed.​

Answer 1

Answer:

A galvanometer with a coil of resistance 120 ohm shows full scale deflection for a current of 2.5 mA. ... Galvanometer can be converted into an ammeter bu putting a shunt in parallel with galvanometer. Therefore, By connecting a shunt of 0.04 Ω across the given galvanometer, we get an ammeter of range of 0 to 7.5 A.

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Answer 2

Answer:

The answer is s= 4*10^-3 ohms and R = 0.03 ohms

Explanation:

s = Ig *G / I - Ig

= 2.5*10^-3 *12 / 7.5 - 2.5*10^-3

= 0.03 / 7.4975

s = 4*10^-3 ohms

The required resistance is ...

R = 120*0.04 / 120+0.04

R = 0.03 ohms