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336 THE BOY ELECTRICIAN

Tungsten Lamps are made for voltages as low as one and
one-half, and will light on one cell of dry battery. The
range of voltages is quite wide and varied. A few of the
most common sizes are given below:

MINIATURE TUNGSTEN BATTERY LAMPS

I. 5 volts ................... for one dry cell

2.5 volts ................... for two-cell flashlight battery
2.8 volts ................... for two-cell flashlight battery
3.5 volts ................... for three-cell flashlight battery
3.8 volts ................... for three-cell flashlight battery
4 volts ................... 4 candle-power

6 volts ................... 2 candle-power

6 volts ................... 4 candle-power

6 volts ................... 6 candle-power

6 volts ................... 8-10-12-16-20-24 candle-power

To find the approximate amount of current drawn from
a battery by a tungsten lamp, divide the
candle-power by the voltage and the re-
sult will be the current in amperes. F or_
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 em-
ployed principally for automobile lighting.
FIG. ,8,._Miniatm The filament of a tungsten lamp is
Tungsten Battery much longer than that of a carbon lamp
Lamp. . . . -

and IS usually 1n the form of a splral or

helix, as shown in Figure 282,.
The bases of battery lamps, the base being the lower

 

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