# adom-fields 0.9.1

- **Electro-thermal coupling.** Copper's resistance rises 0.393 %/°C, so a hot neck dissipates more and runs hotter still.
  - **Every run:** reports the first-order extra Joule heat at the solved temperatures (`review.electroThermal`), and raises an `electro-thermal` issue when it is over 10 %.
  - **With spec `electroThermal: true`:** a second full pass solves the current and the heat with every copper cell at its solved temperature.
  - **On the 20 A ESC:** Joule +33 % (the estimate said +34 %), and the peak rise goes from 109 to 119 °C.
- **Heating transients.** Spec `transient` {durationS, steps, powerScale, fromSteady} steps the still-air heat system through time (implicit Euler, on geometric time steps).
  - **Heat capacities:** copper, FR4 and the solid bodies by material.
  - **Results:** the board peak and each hot part's rise over time, and each part's time constant to 63 % of its steady rise.
  - **Uses:** a motor stall at 3× power, a hot-plug surge, how long a part can run before it overheats.
  - **On the buck:** U1 takes about 2 minutes, L1 about 3.