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- Types of Moving Coil Galvanometer
- Current Sensitivity of a Galvanometer
- Voltage Sensitivity of a Galvanometer
Current Sensitivity
This is defined as the deflection produced in galvanometer when a unit current flows through it.Current sensitivity $CS =\frac{\theta}{ I }=\frac{ NAB }{ C }$ radian/ampere or division/ampere(a) The sensitivity can be increased by increasing number of turns in coil (N), area of cross-section of coil (A), magnetic field B and decreasing torsional constant (C).(b) The reciprocal of current sensitivity is called figure of merit.Figure of merit $FM =\frac{ I }{\theta}=\frac{ C }{ NAB }$ Voltage Sensitivity This is defined as the deflection produced in galvanometer when a unit voltage is applied across its terminals.Voltage sensitivity $VS =\frac{\theta}{ V }=\frac{\theta}{ IR }=\frac{ NAB }{ CR }$ division/volt, where R is resistance of coil.- Shunting a galvanometer reduces its current sensitivity.
- Types and Effects of Electric Current
- Ohm’s Law and Resistance
- Combination of Resistances
- EMF and Internal Resistances of a Cell
- Cells Connected in Series, parallel and Mixed
- Kirchhoff’s Circuit Law
- Electric Currents in Conductors
- Wheatstone Bridge
- Post office Box
- Wheatstone Meter Bridge
- Moving Coil galvanometer
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