GALVANOMETER
 
 
 
GALVANOMETER
 
    Galvanometer is an electromechanical instrument which is used for the detection of electric currents     through a circuit. Being a sensitive instrument, Galvanometer can not be used for the measurement of     heavy currents.
WORKING PRINCIPLE
 
    Galvanometer works on the principle of conversion of electrical energy into mechanical energy.
ESSENTIAL PARTS OF GALVANOMETER
 
    There are five essential parts of a Galvanometer.
    1. A U-shaped permanent magnet with concave poles.
    2. Flat rectangular coil of wire.
    3. A soft iron cylinder.
    4. A pointer or needle.
    5. A scale.
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CONSTRUCTION
 
    The flat rectangular coil of thin enamel insulated wire of suitable number of turns wound on an aluminum     frame is suspended between the poles of U-shaped magnet by a thin strip. One end of the wire of coil is     soldered to connect to an external terminal. The other end is soldered to a loose and soft spiral. A soft     iron cylinder is placed within the frame of coil.
WORKING
 
    When the current is passed through the coil it becomes a magnet. There is force of attraction is setup     between the poles of magnet and coil. As a result a couple is produced in the coil and it is deflected.     The current passes through the coil and the angle of deflection has a direct relation with each other.     The deflection is measured by a pointer attached to the coil.
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