Advertisements
Advertisements
प्रश्न
Can a galvanometer as such be used for measuring the current? Explain.
Advertisements
उत्तर
Yes a galvanometer can be used for measuring the current
Conversion of a galvanometer into an ammeter
A shunt (low resistance) is connected in parallel with a galvanometer.
`S=(I_g/(I-I_g))G`
Here,
I = total current in circuit
G = resistance of the galvanometer
S = resistance of the shunt
Ig = current through the galvanometer
संबंधित प्रश्न
Why does a galvanometer show a momentary deflection at the time of charging or discharging a capacitor? Write the necessary expression to explain this observation.
Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer?
Increasing the current sensitivity of a galvanometer may not necessarily increase its voltage sensitivity. Explain, giving reason.
Write current sensitivity of a galvanomete S.I. unit.
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 ______.
When a galvanometer is shunted with a 4 Ω resistance, the deflection is reduced to one-fifth. If the galvanometer is further shunted with a 2 Ω wire. The further reduction (find the ratio of decrease in current to the previous current) in the deflection will be (the main current remains the same)
Explain in brief the basic construction of a moving-coil table galvanometer whit a neat labelled diagram.
To convert a moving coil galvanometer into an ammeter we need to connect a ______.
The figure below shows a circuit containing an ammeter A, a galvanometer G and a plug key K. When the key is closed:
A galvanometer of resistance 100 Ω gives a full-scale deflection for a potential difference of 200 mV.
- What must be the resistance connected to convert the galvanometer into an ammeter of the range 0-200 mA?
- Determine resistance of the ammeter.
