EEE Formulas

EEE Formulas is a pocket reference for electrical and electronic engineering. Every formula is typeset clearly, every symbol is explained with its SI unit, and each topic has clear circuit diagrams, worked examples with real numbers and practice questions with tap-to-reveal answers. What the app covers • Basic Quantities and Units: SI units and prefixes, component marking codes, charge and current, voltage and EMF, Ohm's law, power, energy, kWh and efficiency, resistivity with a table of materials at 20 °C, Coulomb's law and electric field • DC Circuits: series and parallel resistors, voltage and current dividers, Kirchhoff's laws, mesh and nodal analysis, star–delta conversion and the Wheatstone bridge • Network Theorems: Thevenin, Norton, source conversion, superposition and maximum power transfer • Capacitors and Inductors: capacitance, inductance, series and parallel combinations, stored energy, mutual inductance, RC and RL transients and time constants • AC Circuits: peak, RMS and average values, phasors, reactance, impedance and admittance, series and parallel RLC circuits, resonance, Q factor and bandwidth, real, reactive and apparent power, power factor and power factor correction • Three-Phase Systems: phase and line voltages, star and delta connections, three-phase power and the two-wattmeter method • Transformers and Machines: ideal transformer, losses, efficiency and regulation, DC motors and generators, induction motor speed and slip • Semiconductors: diodes, rectifiers and smoothing, Zener regulators, LED series resistors, bipolar transistors and MOSFETs • Op-Amps, Filters and Decibels: ideal op-amp rules, inverting, non-inverting, follower, summing, difference, integrator and differentiator circuits, RC low-pass and high-pass filters, dB, dBm, dBW and dBV • Digital Electronics: binary, octal and hexadecimal numbers, two's complement, logic gates with truth tables, Boolean algebra and De Morgan's laws • Components, Codes and Safety: circuit symbols, resistor colour code, E6, E12 and E24 standard values, and electrical safety with mains voltage Made for studying • Original schematics drawn with clean symbols: resistors, capacitors, inductors, sources, diodes, transistors, op-amps and logic gates • Phasor diagrams, power triangles, RC charging curves, resonance curves, frequency response plots and star/delta diagrams • Every formula with a list of its symbols and units • Worked examples and practice questions in every topic • Search across all topics • Previous and Next buttons to work through a section in order • Dark mode • Works offline, with no account needed • Available in 8 languages: English, Español, Português, Français, Deutsch, العربية, हिन्दी and Bahasa Indonesia For electrical and electronics students, technicians, apprentices and hobbyists. Content is checked against OpenStax University Physics, NIST reference data and IEC/IEEE conventions. This app is an independent study aid. It is not affiliated with any exam board, textbook publisher or standards body. Always follow local wiring regulations, and work on mains equipment only if you are qualified.