Electricity
Decided: fix the elementary charge e = 1 × 10^-16 onus exactly (12^-18 dec).
Why: a round fixed constant, exactly like SI. imp × riv is always a vig (89.3 W), so e only decides how that is split between voltage and current. This split puts the imp at 7.27 V and the riv at 12.3 A, where the everyday numbers fall best: the voltages printed on batteries, chargers, cars and sockets need no prefix (car 1;8 im, mains 28 or 29 im), and household currents are about a riv (a kettle 0;X riv, a 16 A circuit 1;4 riv). Replaces the earlier e = 1 × 10^-15 (riv 1.02 A, imp 87.2 V), which made currents neat but left every everyday voltage needing a prefix (AA 2;6 b↓im, car 1;8 u↓im).
Advantage: the numbers people actually read - voltages on labels and sockets, currents on chargers and circuits - mostly need no prefix.
flowchart LR e(["e = 1 × 10^-16 os"]) --> os["onus: charge<br>4.27 C"] os -->|"per blink"| ri["riv: current<br>12.3 A"] op["opus: energy<br>31.0 J"] -->|"per onus"| im["imp: voltage<br>7.27 V"] os --> im im -->|"× riv"| vg["vig: power<br>89.3 W"] ri --> vg
- 1 onus (charge) ≈ 4.266 C
- 1 riv (current, onus/blink) ≈ 12.285 A - about what a socket circuit carries (10-16 A)
- 1 imp (voltage, opus/onus) ≈ 7.268 V
- Common voltages aren't round (set by chemistry and history), but they're all plain imps. Small ones use the uncia-imp (u↓im, 0;1 imp ≈ 0.606 V), and small currents the tricia-riv (t↓ri ≈ 7.1 mA):
| Voltage | imp | uncia-imp |
|---|---|---|
| 1.5 V (AA) | 0;258 | 2;58 |
| 5 V (USB) | 0;830 | 8;30 |
| 12 V (car) | 1;799 | 17;99 |
| 24 V | 3;376 | 33;76 |
| 120 V mains | 14;62 | |
| 230 V mains | 27;79 | |
| 240 V mains | 29;03 |
| Current | riv |
|---|---|
| 20 mA (LED) | 0;003 (2;9X t↓ri) |
| 2 A (phone charger) | 0;1E5 |
| 10 A (AU socket, kettle) | 0;992 (≈ 0;X) |
| 16 A (EU socket circuit) | 1;376 |
| 20 A (US circuit) | 1;765 |
| 32 A (oven, EV charger) | 2;731 |
- Rejected: e = 1 × 10^-15 (riv 1.02 A, imp 87.2 V: every everyday voltage needs a prefix); 1 × 10^-17 (imp 0.61 V, riv 147 A: voltages are whole numbers, but a phone charger is 0;017 riv); 0;2 × 10^-15 (imp 14.5 V, riv 6.1 A: a car battery is about 1 imp, but mains and sockets come out no better).
- No choice makes both close to SI: imp × riv = vig (89.3 W), fixed by the mechanical units, where volt × amp = 1 W. The split can only trade one for the other.