Quick Answer: The Galvanometer is a permanent magnet moving coil meter with a centre-zero 30 - 0 - 30 scale, used to detect small currents and find the null point in bridge circuits. It has a nominal sensitivity of 20 µA per division.
Last updated: October 2026
Key Features
Permanent magnet moving coil (PMMC) movement
Centre-zero scale, 30 - 0 - 30 DC
Sensitivity 20 µA/div (nominal)
Internal resistance 100 ohm (±10%)
ABS housing with acrylic viewing window
Technical Specifications
Specification
Value
Movement
Permanent magnet moving coil (PMMC)
Scale
30 - 0 - 30 DC, centre zero
Sensitivity
20 µA/div (nominal)
Internal resistance
100 ohm (±10%)
Housing
ABS with acrylic window
Dimensions
125 mm x 100 mm x 90 mm (approx.)
About This Product
With its centre-zero scale the galvanometer shows which way a current flows, so students can balance a Wheatstone bridge or meter bridge by moving the jockey until the pointer reads zero. It is also used to show the brief currents induced when a magnet moves in a coil.
Frequently Asked Questions
Why does the galvanometer have a centre-zero scale?
The 30 - 0 - 30 scale lets the pointer swing either way, showing the direction of current and making the null point easy to find.
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