Basic Electrical Calculations Cheat Sheet (PDF)

The formulas you actually use on the tools, on one clear 4-page sheet, each with a worked example so you can check your own working.

WHAT IS INSIDE

• Ohm's law and DC power, with a find-anything table
• Resistors and capacitors in series and parallel, voltage divider
• Single-phase and three-phase power: kW, kVA, kVAr, power factor and current from a load
• Reactance, impedance and power factor correction
• Motors: full load current, synchronous speed, slip, torque, star and delta
• Cable resistance and voltage drop (formulas and a worked example)
• Energy cost, kW to hp, kVA to kW, temperature and unit conversions
• 4-20 mA and 0-10 V scaling, raw counts, maximum loop resistance
• AWG to mm2 table and numbers worth remembering

WHO IT IS FOR

Electricians, apprentices, automation techs, and anyone studying for a trade course.

WHAT YOU GET

One PDF, A4 size, instant download after payment. Print it or keep it on your phone.

GOOD TO KNOW

• General formulas, not tied to any one country's wiring standard. It does not include cable ratings or voltage drop limits: check the rules where you work.
• A guide only. Always verify against your wiring rules and the manufacturer's data.
• For personal use. Please do not share or resell the file.

Made by Basic Sparky: PLCs and automation, made simple. Free calculators at app.basicsparky.com.