Galvanometer Current Sensitivity (θ/I = NAB/k)
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θ/I = NAB/k
What each symbol means
| Symbol | What it stands for |
|---|---|
| A | Area of coil (m²) |
| B | Magnetic field strength (T) |
| N | Number of turns in coil |
| k | Torsion constant of suspension (N·m/rad) |
| θ/I | Current sensitivity (rad/A or div/A) |
When to use this
Moving coil galvanometer at equilibrium: NIAB = kθ. Higher sensitivity → more deflection per unit current. Voltage sensitivity = NAB/(kR). For ammeter: add low shunt resistance. For voltmeter: add high series resistance.