6 volts. 6 candle-power
6 volts. 8-10-12-16-20-24 candle-power
Fig. 282.—Miniature Tungsten Battery Lamp.
To find the approximate amount of current drawn from a battery by a tungsten lamp, divide the candle-power by the voltage and the result will be the current in amperes. For example, a 6 v. 2 c. p. lamp will require, 2 divided by 6, or one-third of an ampere.
Six-volt tungsten lamp giving a light greater than six candle-power are only used on storage batteries and are employed principally for automobile lighting.
The filament of a tungsten lamp is much longer than that of a carbon lamp and is usually in the form of a spiral or helix, as shown in Figure 282.
The bases of battery lamps, the base being the lower portion of the lamp, which is made of brass and fits into a socket or receptacle, are made in three different styles: miniature, candelabra, and Ediswan.
Fig. 283.—Lamps fitted respectively with Miniature, Candelabra, and Ediswan Bases.