Write two reasons why a galvanometer can not be used as such to measure current in a given circuit. Name any two factors on which the current sensitivity of a galvanometer depends.
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Galvanometer cannot be used as such because:
1) Galvanometer coil have high resistance. When connected in series they can increase the effective resistance of circut and change the value of current.
2) Galvanometer is sensitive to even microamperes of current. It gives full scale deflection even for small current.
Current sensitivity depends on:
1) directly propotional to number of turns.
2) directly propotional to magnetic field.
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A. It shows full deflection for very small amount of current
B.large amount of current may damage the galvanometer
Current sensitivity is given by deflection produced when a unit current is passed through it
Is= NBA/k
It depends upon the no. of turns of coil and magnetic field B
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