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Anonymous users2024-02-051. Circuit.
2. Path, open circuit, short circuit.
3. The formation of electric current.
4. The direction of the current.
5. Power supply. 6. Power supply is the conversion of other forms of energy into electrical energy.
7. Outside the power supply, the direction of the current is from the positive pole of the power supply to the negative pole.
8. There is a condition of continuous current.
9. a conductor. 10. an insulator.
11. The use of ammeter.
12. Voltage is the cause of the formation of current in the circuit, SI unit: volts (v);
Commonly used: kilovolts (kv), millivolts (mv).1 kV = 1000 V = 1000000 mV.
13. Rules for the use of voltmeter.
14. Memorized voltage value:
15. Resistance (r).
16. Factors that determine the size of the resistance.
17. Sliding rheostat:
18. Ohm's law.
Formula: i=u rThe unit in the formula is: i ampere (a); u volts (v); r Euro ( ).
19. The unit of electric work: joules, referred to as coke, symbol J; Kilowatt-hours are commonly used as the unit of electrical work in daily life, commonly known as the "degree" symbol.
1 degree = 20 An energy meter is an instrument that measures how much electrical energy is consumed over a period of time.
21 Electric work formula: w=pt=uit (unit w joule (j); u volts (v); i Ann (a); t seconds).
22. Electrical power (p).
23 Rated voltage (U0).
Rated power (p0).
24 Joule's Law.
25 Home Circuits.
26 All household appliances and sockets are connected in parallel. And the electrical appliance should be connected in series with its switch.
27 fuses.
28 There are two reasons for excessive circuit current: one is a short circuit in the circuit; Second, the total power of electrical appliances is too large.
29 Principles of safe use of electricity.
30.Magnetism: The property of an object to attract substances such as iron, nickel, cobalt, etc.
31.Magnets: Objects that have magnetic properties are called magnets. It has a point: Guide North.
32.Magnetic poles: The most magnetic part of the magnet is called the magnetic pole. Any magnet has two poles, one is the north pole (n pole); The other is the South Pole (S-pole).
33.Interaction between poles: Poles of the same name repel each other, and poles of different names attract each other.
34.Magnetization: The process of making an object that was not originally magnetically magnetic.
35.There is a magnetic field around the magnet, and the interaction between the poles takes place through the magnetic field.
36.The basic properties of magnetic fields.
37.The direction of the magnetic field.
38.Inductance lines.
39.The north pole of the geomagnetic field is near the south pole of the geographical location; Whereas, the south pole of geomagnetism is near the north pole of geography.
40.Proved by Oster experiments.
41.Ampere's rule.
42.Factors that affect the magnetic strength of an electromagnet.
43.Characteristics of electromagnets.
44.Electromagnetic relays.
45.**Fundamentals: Vibration, Intensity Change, Current, Vibration.
46.Electromagnetic induction.
47.The condition under which the induced current is generated.
48.The direction in which the current is induced.
49.The effect of the magnetic field on the electric current.
50.The direction in which the energized conductor is subjected to force in a magnetic field.
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Anonymous users2024-02-04Preliminary understanding: voltage resistance, Ohm's law, electrical power, electricity and magnetism, information transmission, etc.
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