Electric Lights
87. Kinds of Electric Lamps in Use. The electric lamps on the market now are either tungsten (also called Mazda) or metallized carbon (called gem carbon) lamps. Of all lighting appliances, electric lamps and systems are most easily cared for. If properly selected, they make an excellent light from the standpoint of hygiene. It is important for every one to know enough about lighting to be able to select proper kinds and sizes of lamps.
88. Electrical Measurements. A volt is the unit of electric pressure which compares with the pound as the unit of water pressure.
An ampere is the unit of electricity flowing thru a wire which compares to the gallon as the unit of water per minute flowing thru a pipe.
A watt is the unit of electrical power. It is determined by multiplying the volts by the amperes.
A kilowatt equals 1000 watts.
A kilowatt hour equals 1000 watt-hours.
A watt-hour is the amount of energy needed by a device which uses one watt and is operated for one hour. For example, a 25-watt lamp uses 25 watts, and if it is operated one hour, it uses 25-watt hours of electricity.
The cost of burning an electric lamp is the number of watts marked on the lamp multiplied by the hours the lamp is burned, and then translated into kilowatt hours and multiplied by the price per kilowatt hour.
