Question

A galvanometre of 100 ohm resistence coil shows 50 micro ampere whole difflex .how much resistance should be added to make
1. 50 volt voltmetre
2. 10 m a ametre​

Answer 1

Step-by-step explanation:

A shunt resistance (S) need to be connected to galvanometer in

parallel to convert into ammeter.

galvanometer resistance = 100

I(g) = 20 A

1 A for 100 th division.

So for 50 divisions it will be 100 A.

So we need to make ammeter of 0 - 100 A

I = 100 A

S =

(I−I(g))

I(g)×G

S =

(100−20)

20×100

S =

80

200

S = 2.5 Ohm

Answer 2

Answer:

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1.

resistance needed = V / I

100 = 50 / I

I = 1/2

I = 0.5 A

2.

RESISTANCE = V / 10 ^-1

100 = V

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