When the
Generator closed wire is moving in the cutting magnetic line, the current will be generated. The stator of the generator is equivalent to the closed wire. The rotor is the magnetic field. The rotor rotates and the stator generates an electromotive force. When the line is closed, the current flows. Magnets, as well as magnets, are attractive to metals such as iron and are called magnetic forces.
Concepts derived from basic concepts: 1. Magnetic field. We can understand the magnetic field from the magnetic field. The landlord should know that when a piece of iron has a certain distance from the magnet, the magnet has already attracted the piece of iron, but they have not touched it. So we need a concept of a magnetic field, saying that there is a magnetic field around a magnet, and all the iron in the magnetic field will be subjected to magnetic force. In theory, the magnetic field of any magnet can extend infinity, but in reality the magnetic force is so small that humans can't detect it in a short distance.
2. The electric field electric field is similar to the magnetic field, except that the objects that produce the action are different. The magnetic field generates a magnetic force to the iron therein, and the electric field generates an attractive or repulsive force to the electric charge therein.
3. The electric current that moves in the electric field is the current. For example, countless electrons move along a copper wire. We define the current in the opposite direction of the charge motion (because the electrons are negatively charged, but can directly ignore all the occurrences here. The difference between positive and negative signs, two opposite things, one is positive, the other is negative, and there is no essential difference.
4, the so-called electricity from the generator, can be understood as the above current, a copper wire connected to the generator, running the generator, there is a current flowing in the copper wire, it is said that the generator is powered. Ok, start to answer the question of the landlord, how does the generator generate electricity? A law: Faraday's law of electromagnetic induction. A human finds that a piece of metal, such as a copper wire, moves in a magnetic field, and an electric field is generated inside the metal. (The landlord understands this sentence on it, the following landlord can not see, does not affect understanding.
The movement of the conductor is such that it conforms to the condition perpendicular to the magnetic field lines, and at least there is a component of motion perpendicular to the magnetic lines of force. What is a magnetic field line can be simply understood as a connection between two opposite magnetic poles. What is a magnetic pole? It is the two ends of a magnet, which are attracted by the same sex and repelled by the opposite sex. )
The generator is based on this law, and an electric field is generated inside the metal. We combine the concepts of 2, 3, and 4 to find that the charge inside the metal flows along the electric field. If the metal is not a ring, the charge will accumulate at both ends, in the form of voltage, and the metal is connected in a loop (the loop is not in the magnetic field except for the metal), and a current is generated. So, the generator sent electricity. Of course, the design of the generator is another matter. The basic principle is to fix the permanent magnet or the metal, let the metal or the permanent magnet keep moving. The movement is relative, so that the non-stop magnetic field The metal in motion will generate electricity continuously. As can be seen from the above, the part that consumes energy during power generation is the maintenance of the movement of that metal in the magnetic field. From this point, different generators can be distinguished. The hydroelectric generator uses the energy of water falling from a high place to maintain the movement of the metal. The thermal power is to maintain the metal movement by the force of the steam generated by the boiling water.
May 09, 2019
