Difference Between Moving Coil & Moving Iron Instruments

The comparison between Moving Coil & Moving Iron Instruments is given in the table below.

S.No. Moving Coil Instruments Moving Iron Instruments
1. It works on the principle of DC motor. It works on the principles of magnetism.
2. Deflection torque is proportional to current. Deflection torque is proportional to the square of the current.
3. Damping is provided by the eddy current. Damping is provided by air damping.
4. Spring controlled instruments. Gravity controlled instruments.
5. Controlling torque is proportional to the angle of defection. Controlling torque is proportional to Sinθ.
6. Uniform Scale Non-Uniform Scale
7. Delicate, sensitive and accurate. Robust, reliable, and accurate
8. Costly Cheap
9. Low power consumption high power consumption than moving coil.
10. It is used only in DC Circuits. It is used both in AC and DC Circuits.
11. Can be used as Voltmeter, Ammeter, Galvanometer, ohmmeter Can be used as Ammeter, Voltmeter, and Wattmeter.

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