Question

It is required to convert a galvanometer of current range 0 to 15 milliampere and voltage range 0 to 750 milli volt into(a) an ammeter of range 0.315 ampere and (b) voltmeter of range 0-150 milli volt . Calculate the respective resistance required

Answer 1

this is a answer to your question.

Answer 2

Answer:

The respective resistance required is 2.4 Ohm.

Explanation:

Given Curren range I₍g₎ = 0 to 15 mA

$= 15 \times {10}^{ - 3} A$

And Voltage range V₍g₎=0 to 750 mV

$= 7.5 \times {10}^{ - 1} V$

Here

$I = 0.315A$

We know,

$S=G \frac{I₍g₎}{I − I₍g₎}$

Again

$G = \frac{V₍g₎}{I₍g₎}$

Now,

$S= \frac{V₍g₎}{I₍g₎} \frac{I₍g₎}{I − I₍g₎} = \frac{75 \times {10 }^{ - 1} }{0.315 - 0.015} = \frac{0.75}{0.3} = 2.4 \: Ohm$

The respective resistance required is 0.03 Ohm.