Advertisements
Advertisements
प्रश्न
Outline the necessary steps to convert a galvanometer of resistance RG into an ammeter of a given range ?
Advertisements
उत्तर
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
संबंधित प्रश्न
An ideal voltmeter has _______.
(A) low resistance
(b) high resistance
(C) infinite resistance
(D) zero resistance
Write current sensitivity of a galvanomete S.I. unit.
A coil of radius 10 cm and resistance 40 Ω has 1000 turns. It is placed with its plane vertical and its axis parallel to the magnetic meridian. The coil is connected to a galvanometer and is rotated about the vertical diameter through an angle of 180°. Find the charge which flows through the galvanometer if the horizontal component of the earth's magnetic field is BH = 3.0 × 10−5 T.
Define the term ‘current sensitivity’ of a moving coil galvanometer.
A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?
Assertion (A): On Increasing the current sensitivity of a galvanometer by increasing the number of turns may not necessarily increase its voltage sensitivity.
Reason (R): The resistance of the coil of the galvanometer increases on increasing the number of turns.
Select the most appropriate answer from the options given below:
A galvanometer having a coil resistance of 60 Ω shows full-scale deflection when a current of 1.0 amp passes through it. It can be converted into an ammeter to read currents up to 5.0 amp by:
The coil of galvanometer consists of 100 turns and effective area of 1 square cm. The restoring couple is 10-8 N-m/rad. The magnetic field between the pole pieces is 5T. The current sensitivity of this galvanometer will be ______.
Explain in brief the basic construction of a moving-coil table galvanometer whit a neat labelled diagram.
