Question

What is difference and use of ammeter and galvanometer?

Answer 1

Galvanometer:
A galvanometer gives the direction of current in circuit. In galvanometer a loop of wire is wounded on an armature which is placed between magnets. The armature is supported between a very sensitive spring arrangement. A pointer is attached to this spring. when current flows through the loop then the armature experiences a torque due to electromagnetic induction which tends to rotate the sprig. This gives a deflection in the pointer. The deflection of pointer gives the corresponding reading on the scale attached to it.

Ammeter is used to measure electric current in the circuit. Ammeter works on the same principal as stated above. If a shunt ( a low resistance wire in this case) is placed in parallel with a galvanometer then becomes an ammeter.