With the development of our human science and technology, human beings have made more and more progress in the field of generators. From ancient kerosene lamps to today's generators, there is the power of human science and technology, and now power. generation The raw materials of the machine are diverse. For example, high-power neodymium magnets are now used to make generators, so the question arises: what is the principle of using high-power neodymium magnets to make free energy generators? For this problem, the principle is mainly electromagnetic induction.
In physics, the reason electric lamps produce light is due to electromagnetic induction. They emit light through electric current, and there are also big differences between generatorsand electric lamps. power, the principle of the generator is therefore relatively deep. Therefore, the generator mainly uses many turns of wires, as well as high-power neodymium magnets. A certain magnetic field will be formed between the two, resulting in magnetic induction. So during this process a generator will be generated. Therefore, the principle of using high-power neodymium magnets to make generators is to use electromagnetic induction.
In fact, in our daily life, many phenomena use electromagnetic induction. For example, the trains we often build all use magnetic fields. The principle is essentially electromagnetic induction, and the earth itself is. a A very large magnetic field, so many materials on earth have their own small magnetic field. In their own little magnetic fieldsticks, a certain current will form. Therefore, after humans used such current, people received a lot of it. help, so people use high power neodymium magnets to make generators, which also use electromagnetic induction.
Electromagnetic induction has therefore also brought us many benefits in our lives. Some people may think that we can't see electromagnetic induction, so electromagnetic induction does not exist, but in fact, scientists have given the answer in. previous centuries, otherwise there would be no electric lightSo the same goes for generators, and the use of high-power neodymium magnets to make generators also uses the principle of electromagnetic induction .
How can we easily produce electricity?
Electromagnetism was discoveredby Oersted. Principle: There is a magnetic field around a current-carrying conductor. The relationship between the direction of the magnetic field and the current can be determined. Electromagnetic induction
Electricity and magnetism are inseparable, they are always linked. To put it simply, electricity produces magnetism, and magnetism produces electricity.
Electricity produces magnetism
If a straight metal wire passes through a current, a circular magnetic field will be generated in space. around the wire. The greater the current flowing in the wire, the stronger the magnetic field produced. The magnetic field forms a circle around the wire. The direction of the magnetic field can be determined according to the "right hand spiral rule" (also known as Ampère's rule) (see Figure 1): extend the thumb of your right hand and bend the other four fingers together towards the palm. At this moment, the didirection of the four fingers is the direction of the magnetic field and the direction of the thumb direction is the direction of current flow. In fact, the magnetic field generated by this straight wire is similar to the effect obtained by placing a circle of small magnets with NS poles connected end to end around the wire.
The flow of positive charges gives the same current as the flow of negative charges in the opposite direction. Therefore, when measuring current, the positive and negative values of the circulating charge can generally be ignored. By convention, all charges flowing are assumed to have a positive value and this flow is called conventional current. Conventional current represents the net effect of charge flow, regardless of the sign of the carrier's charge.
In solid metals, positive charge carriers cannot circulate, only electrons circulate. Because electrons carry a negative charge, electrons flow in the metal in the opposite direction to conventional current flow.
Magnetic field relationship Bend and edit this paragraph
If a long metal wire is wound in one direction on a hollow cylinder, the object formed is called a solenoid. What happens if this solenoid is energized? After power on, each turn of the solenoid will generate a magnetic field and the direction of the magnetic field is indicated by the circular arrow in Figure 2. Then to the position between two adjacent turns, due to the opposite direction of the magnetic field , the total magnetic field is canceled while inside and outside the solenoid, the magnetic fields generated by each turn of the coil are superimposed; ultimately forming the figure shown in Figure 2. The shape of the magnetic field shown. We also see that the shape of the magnetic field outside the solenoid is the same as that produced by a magnett. The magnetic field inside the solenoid simply forms a closed magnetic field line with the external magnetic field. In Figure 2, the solenoid is shown as a top and bottom row of circles, as if the solenoid was cut in the middle. There is a cross in the top row, which means current flows from inside the fluorescent screen; There is a black dot in the bottom row, which means current flows from outside to inside of the fluorescent screen.
Application Example Fold and edit this paragraph
An example application of electromagnetism is the electromagnet commonly used in laboratories. In order to conduct certain scientific experiments, powerful constant magnetic fields are often used, but ordinary solenoids are not enough. To this end, in addition to winding as many coils as possible, two opposing solenoids are also placed atproximity to each other so that their N and S poles face each other. In this way, the two bundles of wires directly generate a strong magnetic field. Additionally, pure iron (called yoke) is placed in the middle of the wire bundle to bring the magnetic field lines together and enhance the magnetic field in the middle of the wire bundle. For a very long solenoid, the size of the internal magnetic field. is calculated using the following formula: H=nI
In this formula, I is the current flowing through the solenoid and n is the number of turns of the solenoid per unit length.
What will happen if there are two live straight wires close to each other? We first assume that the current directions of the two wires are opposite, as shown in Figure 5(a). Then, according to the above explanation, circular magnetic fields are generated around the two wires and the directions of the magnetic fields are opposite. What will indicateit the position between the two wires? It is not difficult to imagine that the direction of the magnetic field is the same between the two wires. It's like placing two magnets between two wires. Their N poles are opposite each other and their S poles are opposite each other.relatively. Since like objects repel each other, these two wires will create a repulsive force. Likewise, if two wires carry current in the same direction, they will attract each other.
If a current-carrying wire is in a magnetic field, since the wire also generates a magnetic field, the magnetic field generated by the wire and the original magnetic field will interact, causing a force on the thread. This is the basic principle of electric motors and horns.
Magnetism generates electricity
Magnetism generates electricity was discovered by Faraday. Principle: When part of a conductor in a closed circuit moves to intersect the field linesmagnetic, a current will be generated on the conductor, called electromagnetic induction, and the current generated is called induced current.
The two ends of the conductor are connected to the two terminals of the ammeter to form a closed circuit. As the conductor moves left or right in the magnetic field and intersects the magnetic lines of force, the pointer. the ammeter deviates, indicating that circuit current is being generated there. The current thus generated is called induced current. We know that the number of magnetic lines passing through a certain area is called magnetic flux passing through that area. As the conductor moves left or right to cut the magnetic field lines, the area surrounded by the closed circuit changes, and therefore the magnetic flux through that area also changes. The cause of induced current in a conductor can be attributed to changes in the magnetic flux passing through a closed circuite. It can be seen that as long as the magnetic flux through the closed circuit changes, an induced current will be generated in the closed circuit. This is the condition for generating an induced current. The direction of induced current: When the conductor moves left or right, the pointer of the ammeter deviates in different directions, which shows that the direction of induced current is related to the direction of movement of the conductor. If the direction of movement of the conductor remains unchanged and the two magnetic poles are reversed, i.e. the direction of the magnetic lines of force is changed, it can be seen that the direction of the induced current also changes. It can be seen that the direction of the induced current is related to the direction of movement of the conductors and the direction of the magnetic field lines. The direction of the induced current can be determined by the right hand rule: extend your right hand so that your thumb is perpendulum to the other four fingers and is in the same plane as the palm. and let the magnetic field lines penetrate vertically into the palm of your hand. If the thumb points in the direction of movement of the conductor, then the direction pointed by the other four fingers is the direction of the induced current.
Induced current fold and edit this paragraph
How is induced current generated? Assume that the magnetic field lines of a uniform magnetic field are pointing downward and perpendicular to the surface of the paper, the conductor is placed flat on the paper, the direction is south and north, and the direction of movement is the west. (Use the right-hand rule to determine the direction of the induced current to the south). When the conductor moves westward, it can be seen that the charge in the conductor also moves westward. The relationship between the direction of the force exerted by the charge in the magnetic field, the direction of the magnetic field and the direction of movement. The load can be determined by the left hand rule: Extend your left hand so that the thumb is perpendicular to the other four fingers and is in the same plane as the palm. Put your hand in the magnetic field so that the magnetic field lines. penetrate the palm of your hand perpendicularly and point the four outstretched fingers in the direction of the movement of the charge (West), then the direction pointed by the thumb (South) is the direction of the force on the charge in the magnetic. field. The direction of the current should therefore be towards the south.
Connect the two ends of the coilConnect it to the ammeter to form a closed circuit. When a magnet is inserted or removed from the coil, the ammeter pointer deflects, indicating an induced current in the circuit. Indeed, when a magnet is inserted into the coil, the magnetic flux through the coil increases and when the magnet is removed from the coil, the magnetic flux through the coil decreases. The magnetic flux through the coil changes, producing an induced current. The process of inserting or removing a magnet from a coil can be equivalent to the process by which a conductor cuts magnetic lines of force. The change in magnetic flux is only the superficial cause of the induced current. The real cause is the movement of charges in the coil due to the Lorentz force.
Use film cans to make your own simple generator
The simplest generator is to wind a spool and let the magnet spin at inside, which becomes a brushless generator. .Alternator. In this article, a film box is used as a frame for winding the reel. You can also use medicine bottles, plastic water pipes, etc. In short, you must adapt to local conditions. The aim of our small technological production is to. use all the materials around us...
Tools/raw materials?
Enameled wire (diameter 0.213 mm)
10 cm bicycle spokes long as rotating shaft
2 high strength magnets (glue used in the center of rotating shaft)
Light emitting diode
Film box
< p> 2 sections of plastic straw (to prevent friction between the rotating shaft and the spool)Steps/Method?
1 Drill two small holes in the film box and insert the rotating shaft. There must be a gap on one side, otherwise the tree will not fit. ?
Reading the steps .2 Insert two small pieces of straw into the small holes in the film can so that the rotating shaft can rotate freely inside the straw.
Reading the steps .3 Wind the enameled wire 700 times on it. Do you now know the fanointing these two sections of straw? Without them, the rotating shaft would be tangled in the enameled wire and unable to move.
Reading the steps.4 Use a knife to scrape the insulating paint off the enameled wires at both ends of the coil and wrap them around the two pins of the light-emitting diode.
Reading the steps.4 Use a knife to scrape the insulating paint off the enameled wires at both ends of the coil and wrap them around the two pins of the light-emitting diode.
Reading in steps. p> Reading in stages. 5 Turn the shaft. The magnet rotates in the coil and the magnetic flux in the coil changes, producing an electric current.