A summary of the knowledge points of this section (which will be followed by a corresponding theme, please note):
Analysis
The basic knowledge of electrical science at this point of entry requires knowledge of the following: friction of electricity, generation of currents, identification of chains and connections in circuits, drawing of circuit charts, connection of elements of circuits, use of current and voltage meters and their role in circuits, and knowledge of the patterns of currents and voltage on both basic circuits. While not a difficult and important point in the various examinations, this knowledge point is the basis for good electrology and its importance cannot be overlooked。
Take a break
I. Equipment and equipment
1: grid up: when objects of different materials are frictioning with each other, two different charges can be carried and the same charge is mutually exclusive and alien electricity attracts each other; the amount of the charge is q, expressed as q
2: the function of an electrical inspection is to test whether the friction object is charged or not, and when the friction object is in contact with the electrometallic ball of the electrical examination, if the peeling of the blade indicates that the friction object is charged。
3: when a metal conductor connects two electrons to a metal ball, there is a charge transfer between the two electrons, and an instant current is generated in the conductor, which is directed in the opposite direction of the electron。
Electricity and voltage
1: the direct movement of the charge forms the current, which is in the same direction as the direct movement of the positive charge; a continuous current on the circuit is conditional on the availability of the power to form a circuit。
2: power is the device that provides the voltage, which is the source of the current。
Iii. Synergy and association
1: the elements of the circuit are connected at the end, the currents form a circuit along a path, one of the circuits is broken, the entire circuit is broken and all electrical appliances in the circuits are not working properly。
2: the power lines in the electrical circuits are connected by the prime minister, with the tails connected, and the circuits can form circuits along multiple routes, with no impact on each other, but there are short circuits on one of the bypass roads, with short circuits on the entire circuit。
Iv. Design to connect objects by circuit, or to draw circuits and circuits by physical circuits
1: linking the physical chart by circuit, the usual requirement being single-line exit, single-line loop, close-column connection, and the order in which the elements are connected corresponds to the given circuit chart。
2: a road map by physical drawing shall first analyse the connection of the elements of the physical circuit and then draw the corresponding circuit map; if the electrical connection requirement is given in the question and the circuit is then designed, the circuit must fully meet the requirements of the subject。
V. Patterns of serial, combined circuits, currents and voltage
1: in a series of circuits, the currents are equal to each other, while the combined total voltage is equal to the sum of the two ends of the electrical appliances。
2: combined with circuits, the total current of dry roads is equal to the sum of the currents of the main roads, and the two ends of the circuits are equal to the total voltage of the power supply。
