16. How many candle power should a 20-watt tungsten lamp give if its efficiency is one watt per candle power?
17. What is the "efficiency" of a 40-watt tungsten lamp if it gives 34 candle power?
Review Outline: Current Electricity
Produced by—Chemical action; voltaic and storage cells.
| Three Principal Effects: | Magnetic, electromagnet, uses and applications. |
| Chemical, electrolysis, applications. | |
| Heat, lighting and heating devices. |
Theories: (a) of voltaic cells, (b) of electrolysis.
Units: Ampere, ohm, volt, watt, joule, kilowatt, horse power.
Measurement:
- (a) magnetic effect; galvanometer, ammeter, voltmeter, wattmeter, Wheatstone bridge, construction and use.
- (b) chemical effect; voltameter.