What is moving iron and moving coil?
The moving iron instrument is used for measuring both the direct and alternating current whereas the moving coil is used for the DC measurement. 8. In moving iron instruments, the gravity or spring provides the controlling torque to the instrument.
How does a moving iron work?
Working of the Moving Iron Instrument The moving iron instruments use the stationary coil of copper or aluminium wire which acts as an electromagnet when an electric current passes through it. The strength of the magnetic field induces by the electromagnet is directly proportional to the current passes through it.
What is the function of moving coil?
A permanent magnet is used to produce magnetic flux and a coil that carries the current to be measured moves in this field. The moving iron instrument is used for measuring both the direct and alternating current whereas the moving coil is used for the DC measurement.
What are the advantages of moving coil instrument?
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 the disadvantages of moving coil 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.
What are disadvantage of moving coil instrument?
Demerits or Disadvantages of moving coil instruments Due to friction at the bearings and temperature variations, errors are likely to be present and the observed readings are may not be accurate and fresh calibration of the meters may become necessary.