Understand circuit definition, composition and function; Understand the concept of circuit model; Understand current, voltage, electromotive force and its reference direction deeply; Understand the relationship between Ohm's law, resistance and conductance; Understand the concept of Joule-Leng's law, electric power; Understand the definition of electrical equipment rating and the characteristics of its circuit under different working conditions; Proficient in Kirchhoff's law; Skilled in the knowledge of resistor string, parallel and partial pressure, and shunt; Comprehend the concept of potential in circuit and can Proficiency in calculating the potential at various points in the circuit.
1. The circuit and its components are required to meet the "remember" level.
2. Currents, voltages, electromotive forces and their reference directions are required to meet the "understanding" level.
3. Ohm's law, resistance, and conductance require a "simple application" level.
4. Joule ─ Lenz's law, electric power, required to achieve "simple application" level.
5. The rated value of the electrical equipment and the working status of the electrical circuit are required to reach the level of "understanding".
6. Kirchhoff's Law requires the achievement of a "comprehensive application" level.
7. The series and parallel connection of resistors requires a "simple application" level.
8. The potential in the circuit and its calculations require a "comprehensive application" level.
Emphasis: The concept of voltage, current reference, Kirchhoff's law and potential.
Difficulties: The correct application of voltage and current reference directions and their Hough's law.
1. Circuit and its composition(1) Circuit
A combination of some electrical equipment or components that are connected in a certain way according to the function they are to complete is called a circuit. It is the path of current flow.
(2) The composition of the circuit
Power Supply: A total of power equipment.
Load: Electrical equipment is called load.
Intermediate links: connecting the power supply and load into closed circuit wires, switchgear, and protection equipment are called intermediate links.
(3) Segmentation of the circuit
The equipment and electrical components in the circuit are mainly divided into three categories: power supply, load, and intermediate links (transmission equipment).
The power supply can convert non-electrical energy such as chemical energy, mechanical energy, and atomic energy into electrical energy to provide energy to the circuit.
The load enables the electrical energy in the finger circuit to be converted into non-electrical energy, such as electric lights and motors.
The intermediate link refers to the wire, switchgear, and protection device that connect the power supply and the load into a closed circuit.
(4) Circuit diagram
The actual equipment and the method of basic interconnection are represented by a prescribed graphical symbol called a circuit diagram. When the actual circuit is analyzed and calculated, it is a circuit composed of an ideal electrical element corresponding to the actual electrical element and represented by a unified and prescribed symbol, which is the actual circuit model or model circuit.
Ideal circuit element: After the finger has neglected secondary factors under certain conditions, the electrical element is abstracted to mean an ideal circuit element that contains a parameter, such as the resistance element R, the inductance element L, and the capacitance element C discussed in the book. .
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