Why does a galvanometer when connected in series?
During charging and discharging of the capacitor, there is a flow of charge from the battery towards the plates of the capacitor, which produces a conduction current in the circuit. Hence, the galvanometer present in the circuit shows momentary deflection.
What are the types of galvanometer?
Some of the different types of galvanometer include Tangent galvanometer, Astatic galvanometer, Mirror galvanometer and Ballistic galvanometer. However, today the main type of galvanometer type that is used widely is the D’Arsonval/Weston type or the moving coil type.
What is sensitivity of a galvanometer?
The sensitivity of a Moving Coil Galvanometer is the ratio of the change in deflection of the galvanometer to the change in current. Therefore we write, Sensitivity = dθ/di. If a galvanometer gives a larger deflection for a small current it is a sensitive galvanometer.
What are the advantages and disadvantages of moving coil instruments?
Merits or Advantages of moving coil instruments Moving coil instruments consume quite less power. This is because the resistance of moving coil is small. In Moving coil meters the ratio of torque to weight is quite high and this reduces the errors due to friction. The scale of moving coil instrument is uniform.
What are disadvantages of potentiometer?
Disadvantages of Potentiometer
- The use of Potentiometer is inconvenient.
- The area of cross-Section of potentiometer wire must be uniform which is practically not possible.
- During experiment the temperature of potentiometer wire must remain uniform.
- The major disadvantage is that it requires a large force to move their sliding contacts i.e. wiper.
What are the advantages and disadvantages of galvanometer?
- High sensitivity.
- Not easily affected by stray magnetic fields.
- Torque to weight ratio is high.
- High accuracy and reliability.
What is the drawback of galvanometer?
The disadvantages of a moving coil galvanometer as below: -It can only measure direct current and not alternating current. -Frequently, errors can be seen due to mechanical stress. Now, the number of terms here is N=10, the length of coil is L=12 cm, breadth of the coil is b=8cm.
How can we convert a galvanometer into an ammeter?
A galvanometer is converted into an ammeter by connecting a low resistance in parallel with the galvanometer. This low resistance is called shunt resistance S. The scale is now calibrated in ampere and the range of ammeter depends on the values of the shunt resistance.
Why do we not use galvanometer as an ammeter?
A galvanometer shows a full scale deflection with a very small current. Hence a galvanometer can measure limited current. Therefore as such, a galvanometer can not be used as an ammeter, which can measure the given large current.
How can we convert a galvanometer in an ammeter and voltmeter just draw Labelled circuit diagram?
A galvanometer can be converted into a voltmeter by connecting a large resistance in series to the galvanometer which is shown in diagram. Let G and R be the resistance of a galvanometer and a conductor connected in series with it respectively.
Why must an ammeter to have a low resistance?
An ammeter is an instrument for measuring the electric current in amperes in a branch of an electric current. It must be placed in series with the measured branch, & must have very low resistance to avoid significant alternation of the current it is to measure.