| U | Voltage (V) | Q | Joule heat (J) |
| I | Current (A) | P | Power (W) |
| R | Resistance (Ω) | E | Electric field intensity (V/m) |
| L | Inductance (H) | J | Current density (A/m2) |
| C | Capacitance (F) | r | Resistivity (Ω·m) |
| t | Time (s) | qs | Volume power density (W/m) |
| m | Mass (kg) | k | Heat transfer coefficient (W/(m2·K)) |
| ρ | Mass density (kg/m3) | μ | Permeability (H/m) |
| c | Specific heat capacity (J/(kg·K)) | H | Magnetic field intensity (A/m) |
| q | Conduction heat flux (W/m2) | B | Magnetic induction intensity (T) |
| T | Temperature (K) |
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