Question

Define galvanometer
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Answer 1

$\huge\textsf{Galvanometer:}$

$\huge{→}$ The instrument used to measure strength of Current , by measuring the deflection of the cool due to Torque produced by a magnet field is , know as Galvanometer.

$\huge\textsf{Shunt:}$

$\huge{→}$ The small resistance connected in parallel to galvanometer coil ,in order to control current flowing through the galvanometer , is known as shunt.

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Conversion of Galvanometer into Ammeter :-

A galvanometer can be converted into an ammeter by connecting low resistance in parallel to its coil.

• The value of shunt resistance to be connected in parallel to galvanometer coil is given by -

$\large{\boxed{\sf R_S=\frac{R_gi_g}{i-i_g}}}$

Here ,

i = Range of ammeter

$\sf{i_g}$ = Current required for full scale deflection of Galvanometer

$\sf{R_g}$ = Resistance of Galvanometer coil.

• On connecting shunt in parallel to galvanometer coil, its equivalent resistance becomes less than even the shunt resistance.

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Conversion of Galvanometer into voltmeter :-

Galvanometer can be converted into voltmeter by connecting high resistance in series with its coil

The high resistance to be connected in series with Galvanometer coil is given by -

$\large{\boxed{\sf R=\frac{V}{i_g}-R_g }}$

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Answer 2

Explanation:

A galvanometer is that device which studies small current and helps in various other machines. IT is very helpful in experimental works...