From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test results and notes on the efficiency of charging electrical cells.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan134 | |
| Date | 29th June 1920 | |
| RR 23B (150 BKS.) (SH57. 29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. 5 19 Results in this condition were as below:- | No of cells | Volts | d.c amps | a.c. amps | |---|---|---|---| | 4 | 9.1 | 3.15 | 1.12 | | 5 | 11.3 | 3.10 | 1.15 | | 6 | 13.6 | 2.05 | 1.1 | | 7 | 15.5 | 2.65 | 1.05 | The Royce ammeter was used in all cases for measuring a.c. amperes. Assuming a constant power factor in the a.c. supply, the highest efficiency is obtained when charging four cells through both resistances and the lowest when charging one cell through one resistance. Taking unity power factor these efficiencies (Cont-d) Signed This Sheet must be filed on completion of the work. | ||