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Reproduced with permission from The Inductor Handbook

AE Effective cross-sectional core area   Iav Average current
AL Inductance factor (nanoHenries per turn squared)   L Inductance
ai Area of insulating system   l Layers
al Winding area of one layer   Np Primary turn count
am Winding area of mth winding (m = 1, 2, 3, etc.)   Ns Secondary turn count
at Total winding area   nl Turns per layer
aw Available winding area   PL Power loss
B Maximum flux density (Gauss)   RAC AC resistance
D Duty cycle   RDC DC resistance
DI Duty cycle of current ramp   ΔT Temperature rise
E-T Volt-time product (volt-seconds)   VD Output rectifier and choke voltage drop
g Air gap (per leg)   VL Input rectified line voltage
I Peak current   VS Output Voltage