A galvanometer has 30 divisions and a sensiti | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The full-scale deflection current $i_g$ of the galvanometer is given by:$i_g = 	ext{number of divisions} 	imes 	ext{sensitivity}$$i_g = 30 	im

Vedclass · Accepted Answer

Resistance nearly $6\,k\Omega$ in series

Vedclass · Answer

(A) The full-scale deflection current $i_g$ of the galvanometer is given by:$i_g = 	ext{number of divisions} 	imes 	ext{sensitivity}$$i_g = 30 	imes 16 	imes 10^{-6} \, A = 480 	imes 10^{-6} \, A = 4.8 	imes 10^{-4} \, A$To convert a galvanometer into a voltmeter,a high resistance $R$ is connected in series with it.The formula for the total resistance is:$V = i_g(R + G)$Assuming the internal resistance $G$ of the galvanometer is negligible compared to the high series resistance $R$ (or considering $R+G \approx R$):$R \approx \frac{V}{i_g} = \frac{3}{4.8 	imes 10^{-4}} = \frac{30000}{4.8} = 6250 \, \Omega = 6.25 \, k\Omega$Thus,a resistance of nearly $6 \, k\Omega$ connected in series is required.

$A$ galvanometer has $30$ divisions and a sensitivity of $16\,\mu A/\text{div}$. It can be converted into a voltmeter to read $3\,V$ by connecting:

Similar Questions

$A$ galvanometer having a resistance of $9 \, \Omega$ is shunted by a wire of resistance $2 \, \Omega$. If the total current is $1 \, A$, the part of it passing through the shunt will be ............ $A$.

Fill in the blanks: The possible value of the resistance of an ammeter is ...... and the possible value of the resistance of a voltmeter is ..... . (more,less)

The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be $..........\%$

The resistance of an ideal voltmeter is . . . . . . .

What is the value of shunt resistance required to convert a galvanometer of resistance $ 100 \Omega $ into an ammeter of range $ 1 \text{ A} $? Given: Full scale deflection of the galvanometer is $ 5 \text{ mA} $.

Vedclass Test Series

Exam Paper Generator

Online Exam Module