Shunt.—A coil of wire arranged to take a certain proportion of any current.
Solenoids.—Helices of wire which act like magnets.
Switch.—An apparatus for changing one circuit on to another.
Spectrum.—The elongated figure of the prismatic colours.
Torque.—Term used to express the strain on a shaft due to electro-magnetic action.
Units.—The various bases of any system of measurement.
Volt.—The Unit of electro-motive force and potential. An ampère multiplied by an ohm. ([See Electrical Measurements].)
Voltameter.—An apparatus for measuring the current by its chemical action.
Voltmeter.—An instrument used for measuring E. M. F.
Watt.—The Unit of power. A volt-ampère. The horse-power electrical, taken as 746 B A watts, is equivalent to only 736 true watts. The horse-power electrical is equal to 756 B A watts, which is equal to 746 true watts. The “force de cheval,” or horse-power in use abroad, is defined as 75 kilogrammetres, and is, therefore, 736 true watts.