| Symbol | Definition | Units | Units |
| SI | CGS | ||
| a | no. of winding parallel paths | -- | -- |
| A | area | |
|
| B | flux-density | Tesla | Gauss |
| C | capacitance | farad | farad |
| E | emf, voltage | Volt | Volt |
| d | distance | m | in |
| D | diameter | m | in |
| f | frequency | Hz | Hz |
| F | force | Newton | lb |
| h | distance | m | in |
| H | magnetic coercivity | At/m | Oersted |
| i | current | Ampere | A |
| I | current | Ampere | A |
| J | moment of inertia | |
|
| J | current density | |
|
| kl | leakage constant | -- | -- |
| |
eddy current constant | -- | -- |
| |
emf constant | V/rad/s | V/krpm |
| |
hysteris constant | -- | -- |
| |
reluctance coefficient | -- | -- |
| |
torque constant | Nm/A | oz in |
| l | length | m | in |
| L | inductance | Henry | Henry |
| m | number of coils/phase | -- | -- |
| m | number of phases | -- | -- |
| mmf | magneto motive force | At | Gilbert |
| n | number of turns/coil | -- | -- |
| p | number of poles | -- | -- |
| P | permeance | Wb/At | M/B |
| R | reluctance | At/Wb | B/M |
| R | resistance | Ohm | Ohm |
| s | speed | rpm | rpm |
| S | steps/rev | -- | -- |
| t | time | s | s |
| T | torque | Nm | lb ft |
| v | velocity | m/s | in/s |
| V | supply voltage | Volt | Volt |
| W | energy, work | Joule | Joule |
| z | no. winding conductors | -- | -- |
| |
thermal resistance | 1/°C | 1/°C |
| |
skin depth | m | in |
| |
wave length | m | in |
| |
flux-linkage | Weber | Maxwell |
| |
permeability | Henry/m | Henry/in |
| |
damping factor | -- | -- |
| |
mechanical time constant | s | s |
| |
resistivity | Ohm-m | Ohm-in |
| |
flux | Weber | Maxwell |
| |
natural frequency | rad/s | rad/s |