What is electrical knowledge?

Electrical knowledge covers a broad set of theoretical and practical skills related to the basic principles of electricity, circuit design, operation and maintenance of power systems, and the working principles of electronic devices. Electrical knowledge is not limited to academic theory, but also includes skills and experience in practical applications. Here is an overview of some of the core areas of electrical knowledge:

Basic concept

• Circuit theory: includes the basic components of the circuit (such as power supply, load, switch, etc.), as well as the basic laws of the circuit (such as Ohm's law, Kirchhoff's law).

• Basic laws of electricity: Ohm's law, Kirchhoff's law (KVL and KCL), Joule's law, etc.

Circuit analysis

• Direct current circuit (DC) : Analyzes the behavior of components such as current, voltage, resistance, inductance, and capacitance in a DC circuit.

• AC circuit (AC) : Study the sine wave, phase difference, impedance, inductive reactance and capacitive reactance in AC circuit.

Electronics

• Semiconductor devices: including diodes, transistors (BJT, MOSFET, etc.), integrated circuits, etc.

• Analog electronics: involves the design of analog circuits such as amplifiers, oscillators, and filters.

• Digital electronics: including the design of logic gates, flip-flops, counters, microprocessors and other digital circuits.

Electric power system

• Transmission and distribution system: involving high-voltage transmission lines, substations, distribution networks, etc.

• Power equipment: including generators, transformers, circuit breakers, relays, etc.

• Power quality: such as harmonic analysis, voltage fluctuations, frequency stability, etc.

Motors and drives

• Motor principle: DC motor, AC motor (induction motor, synchronous motor), servo motor, etc.

• Motor control: including frequency converter, soft starter, etc.

Control system

• Automatic control: PID control, feedback control system, servo system, etc.

• PLC programming: Application of programmable logic controller (PLC).

Electromagnetic field and wave

• Electromagnetic theory: Maxwell equations, electromagnetic wave propagation, antenna principle, etc.

• Electromagnetic Compatibility (EMC) : electromagnetic interference (EMI) suppression, shielding technology, etc.

Computer hardware and embedded systems

• Computer architecture: CPU, memory, bus, etc.

• Embedded system: application of MCU, Arduino and other development platforms.

Power electronics

• Converter: AC/DC, DC/AC, DC/DC, AC/AC converter.

• Inverter: Inverter design for renewable energy sources such as solar and wind energy.

Safety and standards

• Electrical safety: electrical protection, grounding protection, lightning protection, etc.

• Electrical standards: such as IEC, IEEE, ANSI and other relevant standards and specifications.

Test and measurement

• Instrument: multimeter, oscilloscope, signal generator, etc.

• Data acquisition: data logger, sensor interface, etc.

Renewable energy

• Solar energy: Design and installation of photovoltaic systems.

• Wind energy: the working principle and technology of wind turbines.

Information Technology and Communications

• Communication principle: digital communication, wireless communication, etc.

• Network technology: local area Network, wide area network, Internet of Things (IoT), etc.

Software tool

• CAD tools: For circuit design and simulation.

• Programming language: such as Python, MATLAB and other applications in electrical engineering.

Sum up

Electrical knowledge is an interdisciplinary field that covers a wide range of topics from basic theory to advanced applications. Mastering electrical knowledge requires not only theoretical learning, but also practical experience through experiments, internships and projects.