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 report detailing readings of voltage, current, and resistance for a Chloride battery.
| Identifier | WestWitteringFiles\C\May1919\ Scan40 | |
| Date | 2nd May 1919 | |
| -5- EPC1/T2.5.19. Contd. point we record a series of readings on one battery, between each of which we increased the resistance by cutting one of the ten resistance wires which, at the start, were all in parallel; the results of the test are given in the following table:- Chloride Battery. Open circuit Voltage. | Current Amps. | Steady terminal voltage when current attained steady value. | Instantaneous voltage reading when current was broken. | Diff: of Voltage. | Battery Resis: 12.30 | 92 | 10.7 | 12.05 | 1.35 | .0147 12.30 | 84.5 | 10.84 | 12.07 | 1.23 | .0146 12.23 | 76 | 10.83 | 12.02 | 1.19 | .0156 12.18 | 68 | 10.90 | 12.01 | 1.11 | .0163 12.16 | 60 | 11.04 | 12.05 | 1.01 | .0166 Interval 12.33 | 52 | 11.27 | 12.14 | .87 | .0167 12.27 | 42.5 | 11.37 | 12.12 | .75 | .0176 12.24 | 32.5 | 11.50 | 12.12 | .62 | .0191 12.24 | 23 | 11.62 | 12.24 | .50 | .0217 Interval 12.28 | 11 | 11.97 | 12.24 | .27 | .0245 We had previously been attempting to measure the internal resistance accurately by using smaller currents of the order of 10 and 1 ampere. The former had led to values of the resistance about twice as great as at 100 amperes. The latter apparently led to values of the resistance the same as those for 100 amperes. We do not attach importance to these as it is difficult to get rid of the effect of change of E.M.F. We are attaching a revised copy of our specification of chassis lighting and starting batteries which represents our latest ideas on the subject. This cancels previous specification. Contd. R.R. 235a 500 (T) (S.D. 408. 26-4-17.) Bm. 2/156/13. | ||