What do galvanometers measure

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Suggested Test Series. The coil is freely moved about its vertical axis of symmetry between the poles of a permanent magnet. The iron core provides the low reluctance flux path and hence provides the strong magnetic field for the coil to move in. Suspension — The coil is suspended by a flat ribbon which carries the current to the coil. The other current carrying coil is the lower suspension whose torque effect is negligible.

The upper suspension coil is made up of gold or copper wire which is made in the form of a ribbon. The mechanical strength of the wire is not very strong, and hence the galvanometers handle carefully without any jerks. Mirror — The suspension carries a small mirror which casts the beam of light. The beam of light placed on the scale on which the deflection is measured. Torsion Head — The torsion head is used for controlling the position of the coil and for adjusting the zero setting.

This action reverses the poles of the magnetic field generated around the coil as the current passes through it, so the coil swings in the opposite direction. To stop the flow of electricity through the coil, click the red Turn Off button. Interactive Tutorials. Last modified on 17 June Main Menu.