Reproduced with permission from The Inductor Handbook

DC Formulas

• Ohm’s Law
• Resistance in Series
• Resistance in Parallel

AC Formulas

• Ohm’s Law
• Voltage & Current
• Inductance in Series
• Inductance in Parallel
• Inductive Reactance
• Reactance in Series
• Reactance in Parallel
• Capacitance in Series
• Capacitance in Parallel
• Capacitive Reactance
• Capacitors in Series
• Capacitors in Parallel
• Impedance
• Resonance
• Frequency
• AC Voltage or Current
• Transformer Relationships
• Efficiency

Magnetic Design

• Effective Core Parameters
• Flux Density
• Field Strength
• Air Core Inductance
• Inductance
• Number of Turns
• Effective Permeability
• Attenuation
• Quality Factor