Question

a galvanometer of resistance 50 ohm has 25 divisions has a current sensitivity of 0.5 div /mA. Convert into voltmeter of 0-50v range​

Answer 1

Answer:

Resistance of galvanometer is R

g

=50Ω

Total current through galvanometer I

g

=25×4×10

−4

=10

−2

A,

Range of voltage ,V=25volt.

For converting galvanometer to voltmeter, we connect a high resistance (HR) in series.

thus, V=(HR+R

g

)I

g

or HR=

I

g

V

−R

g

=

10

−2

25

−50=2500−50=2450Ω