The first volume of this book is the part of electrical technology, which mainly includes circuit components and circuit rules, circuit analysis methods, sinusoidal alternating current circuits, periodic non-sinusoidal current circuits, resonance and frequency response in circuits, three-phase alternating current circuits and safe electricity use, transient process of circuit rhyme, magnetic circuits, alternating core coils and transformers, motors, relay control, and programmable controllers. TINA, an electrical measurement and circuit simulation software, and its application. The second book is the electronic technology part, which mainly includes diodes, triodes, basic amplifier circuits, differential amplifier, power amplifier and integrated operational amplifier, negative feedback in amplifier circuits, application of integrated operational amplifier, logic algebra, combinational logic circuits, sequential logic circuits, generation and shaping of pulse signals, large-scale integrated circuits, etc.