Electricity for Boys Part 19
changes into a low electro-motive force.
Unit. A standard of light, heat, electricity, or of other phenomena.
Vacuum. A s.p.a.ce from which all matter has been exhausted.
Vibrator. Mechanism for making and breaking circuits in induction coils or other apparatus.
Volt. The unit of electro-motive force.
Voltage. Electro-motive force which is expressed in volts.
Voltaic. A term applied to electric currents and devices.
Volt-meter. An apparatus for showing the difference of potential, or E. M. F. in the term of volts.
Watt. The unit of electrical activity. The product of amperes multiplied by volts.
Watt Hour. One watt maintained through one hour of time.
Waves, Electric Waves in the ether caused by electro-magnetic Magnetic. disturbances.
X-rays. The radiation of invisible rays of light, which penetrate or pa.s.s through opaque substances.
Yoke, or Bar. A soft iron body across the ends of a horseshoe magnet, to enable the magnet to retain its magnetism an indefinite time.
Zinc Battery. A battery which uses zinc for one of its elements.