Electrical Engineering ⇒ Topic : Principles of Operation of Electrical Instruments
|
Maninder
| |
Principles of Operation of Electrical Instruments An electrical instrument essentially consists of a movable element and a scale to indicate or register the electrical quantity being measured. The movable element is supported on jewelled bearings and carries a pointer or sets of dials. The movement of the movable element is caused by utilising one or more of the following effects of current or voltage (1) Magnetic effect ........ Moving-iron instruments (2) Electrodynamic effect ........ (i) Permanent-magnet moving coil (ii) Dynamometer type (3) Electromagnetic-induction ........ Induction type instruments (4) Thermal effect ........ Hot-wire instruments (5) Chemical effect ........ Electrolytic instruments (6) Electrostatic effect .......... Electrostatic instruments The principles of operation of electrical instruments are given in the above table for facility of reference. | |
| |
!! OOPS Login [Click here] is required for more results / answer