Plain-language explanation.
Electrical engineering deals with electricity, electronics, and electromagnetism — designing and building electrical systems from power grids to microchips to smartphones. It is behind every electronic device you use, every power outlet you plug into, and every digital signal you transmit.
Core concepts and standard treatment.
Core electrical engineering covers circuit theory (Ohm's law — V=IR; Kirchhoff's laws — KVL, KCL; series and parallel circuits; Thévenin and Norton equivalents; superposition; AC circuits — phasors, impedance — Z=R+jX; power — real, reactive, apparent — power factor; RC/RL/RLC circuits — natural and step response; Bode plots — frequency response), semiconductor electronics (p-n junction — diode equation; transistors — BJT — common emitter, common base, common collector; MOSFETs — enhancement, depletion; amplifier circuits — inverting/non-inverting op-amp; comparators; filters — RC low-pass, Butterworth, Chebyshev; oscillators), digital electronics (logic gates — AND, OR, NOT, NAND, NOR, XOR; Boolean algebra — De Morgan's theorem; Karnaugh maps; combinational circuits — adders, MUX, demux; sequential circuits — flip-flops — SR, D, JK, T; registers, counters; finite state machines), and power systems (three-phase power — balanced loads; transformers — turns ratio, ideal transformer; generators — synchronous; induction motors — slip, equivalent circuit).
Deeper theory, debates and edge cases.
Advanced electrical engineering covers power electronics (DC-DC converters — buck, boost, buck-boost — switch-mode power supplies; inverters — PWM — pulse width modulation; H-bridge — motor drives; grid-tied inverters — PV systems; FACTS — flexible AC transmission systems; HVDC — high voltage direct current — VSC-HVDC — offshore wind), embedded systems and microcontrollers (ARM Cortex architecture; memory hierarchy — flash, SRAM, EEPROM; peripherals — UART, SPI, I2C, CAN; RTOS — FreeRTOS, Zephyr; HAL drivers; hardware debugging — JTAG, SWD; PCB design — KiCad, Altium Designer — signal integrity — EMC — EMI mitigation), and signal processing (Fourier transform — DFT, FFT; Z-transform; digital filters — FIR, IIR; sampling theorem — Nyquist-Shannon; ADC/DAC; DSP processors — TI C6000, SHARC; FPGA signal processing — Xilinx, Intel/Altera — VHDL/Verilog; communications — modulation — AM, FM, QAM, OFDM — LTE/5G PHY layer).
How it is applied in practice.
At the chartered electrical engineer and chief technology officer level, practitioners hold CEng (IET) and contribute to IEEE Transactions on Power Electronics and Proceedings of the IEE; lead power systems design (national grid planning — NGET — transmission system operator; offshore wind grid connection — SSE, Ørsted; EV charging infrastructure — OZEV — Rapid Charging Fund; smart grid — RIIO-T3 regulatory framework — Ofgem); design semiconductor products (ASIC design flow — RTL synthesis — Cadence Genus, Synopsys Design Compiler; physical design — place and route — Cadence Innovus; DFT — design for test; TSMC N3 FinFET process design rules); and contribute to standards and safety (BS 7671 — IET Wiring Regulations 18th Edition; IEC 61511 — functional safety — HAZOP; EMC Directive — EN 55032; IEEE 1547 — distributed energy interconnection).