Joke Collection Website - Public benefit messages - Ali big fish platform, what is the level of SMS 4: 5?
Ali big fish platform, what is the level of SMS 4: 5?
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20. The conductor resistance is related to material, length, cross-sectional area and temperature, but has nothing to do with voltage and current. For example, there is another superconductor without voltage, which is commonly used: transmission line and coil 2 1. Principle of resistance measurement by voltammetry: ohm's law or 22. Faraday in Britain discovered the phenomenon of electromagnetic induction and realized "magnetic power generation", which led to the invention of generator 23. Oster of Denmark found that the direction of magnetic field is related to the direction of current, that is, the magnetic effect of current realizes "electromagnetism". 24. Generator principle: electromagnetic induction, mechanical energy is converted into electrical energy, and the direction of induced current is related to the direction of magnetic field and the direction of conductor movement. 25. Motor principle: The magnetic field acts on the current (the electrified coil is forced to rotate in the magnetic field), and the electric energy is converted into mechanical energy. The rotating direction of the motor is related to the direction of the current and the magnetic field. 26. The cause of the fire:
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