Essential Electrical Engineering Formulas
- Ohm's Law: V = I × R | I = V / R | R = V / I
- DC Power: P = V × I = I² × R = V² / R
- AC Single Phase Power: P = V × I × Power Factor (cos φ)
Electric 8 min read
Electrical Formulas Cheat Sheet: Voltage, Current, Power & Resistance
Reference sheet for core electrical engineering formulas: Ohm’s law, single-phase power, 3-phase power, voltage drop, and AC/DC circuit calculations.
Published August 11, 2026
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Basic Math Tools STEM Editorial Team
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Updated: August 11, 2026
Related Interactive Calculators
Practice ToolsOhm’s Law Calculator
Calculate Voltage (V = I·R), Current (I = V/R), Resistance (R = V/I), and Electrical Power (P = V·I = I²·R = V²/R) across all 12 Ohm's Law power wheel formulas with live circuit visualizers.
Power Calculator
Calculate electrical Power, Voltage, or Current.
Voltage Drop Calculator
Calculate the voltage drop of an electrical circuit based on wire length and current.
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