How many candle power should a 20-watt tungsten lamp give if its efficiency is one watt per candle power?
There are two styles in common use, the carbon and the tungsten lamp.
What is the resistance of a 20-watt tungsten lamp if the E.M.F. is 115 volts?
One 25-watt tungsten lamp or its equivalent provided for every 20 seats will give fairly good illumination in a small theater.
The 30-volt storage battery has become standard for small lighting plants, since the introduction of the tungsten lamp.
Find the resistance of a 40-watt tungsten lamp when the voltage is 115?
In its place was a 100-watt tungsten lamp whose rays made the white table cloth fairly glisten.
What is the "efficiency" of a 40-watt tungsten lamp if it gives 34 candle power?
The tantalum lamp had no opportunity to become established, because the tungsten lamp followed its appearance very closely.
|tungsten lamp |
An incandescent electric lamp having a tungsten filament.