knox grammar school


Science department used Astatic Galvanometer for measuring small electric currents

The Science Department used this galvanometer for measuring small electric currents within a circuit and to determine voltage. It can easily measure one-millionth of the electric current going through a 100-watt Edison light bulb operating on direct current. It can even detect and measure the electric signal of the current generated in a human’s muscle when it is being flexed.
Earlier galvanometers required calibrating to account for the Earth’s magnetic field and that of the subject being measured. This type, astatic galvanometers, uses a mobile magnet to cancel out the effect of the Earth's magnetic field to provide a more accurate reading of the single current.

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