Advertisements
Advertisements
Question
Outline the necessary steps to convert a galvanometer of resistance RG into an ammeter of a given range ?
Advertisements
Solution
Conversion of a galvanometer to ammeter

• A shunt (low resistance) is connected in parallel with the galvanometer.
`S = ((I_g)/(I -I_g))G`
Where,
I → Total current in circuit
G → Resistance of the galvanometer
S →Resistance of the shunt
Ig → Current through galvanometer
APPEARS IN
RELATED QUESTIONS
A rectangular coil of a moving coil galvanometer contains 50 turns each having area 12 cm2 . It is suspended in radial magnetic field 0.025 Wb/m2 by a fibre of twist constant 15 x10-10 Nm/degree. Calculate the sensitivity of the moving coil galvanometer.
Explain how moving coil galvanometer is converted into a voltmeter. Derive the necessary formula.
Why is it necessary to introduce a radial magnetic field inside the coil of a galvanometer?
With the help of a neat and labelled diagram, explain the principle and working of a moving coil galvanometer ?
Define current sensitivity of a galvanometer.
What are the advantages of using soft iron as a core, instead of steel, in the coils of galvanometers?
The current sensitivity of a galvanometer is defined as ______.
The current sensitivity of a galvanometer increase by 20%. If its resistance also increases by 25%, the voltage sensitivity will ______.
A galvanometer having a resistance of 20 Ω and 30 Ω division on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is ______.
