Electricity generates magnetism Magnetism can also generate electricity Why can electricity generate

There is a special substance around the magnet or current, which can transmit the interaction between the magnet and the magnet, the current and the current, and the magnet and the current, and the substance is called the magnetic field. In other words, not only the magnet, but also the electric current has a magnetic field around it, that is, electromagnetism.

When the magnetic flux of a closed loop changes, an electric current is generated in the closed loop, i.e., magnetically generated electricity.

So, electromagnetismMagnetism can also generate electricity, and it is not reciprocal.

Electromagnetism is the presence (generation) of a magnetic field with concentric circles around the wire after the electricity is applied. This is the simplest form of electricity, magnetism. The motor complicates the above form, the energized wire (coil) is subjected to the force in the magnetic field (left-hand rule), rotates, and changes the direction of the current through the commutator, so that it rotates continuously, and the characteristics are:

Electrical energy (there is an electric current in the wire) is converted into mechanical energy (coil turning) to drive other devices. This is the principle of electromagnetism and electric motors.

Magnetism is a part of the wire in the closed circuit in the magnetic field to cut the magnetic inductance line movement, so as to generate current, the key point is to be sure to close the circuit, a part, do the cutting magnetic inductance line movement. (right-handed rule here).

The difference between the two: the motor has a power supply and a commutator, which is essentially electromagnetic, and converts electrical energy into mechanical energy. Generators on the contrary.

A second-year junior high school student in Shenzhen.

Electricity generates magnetism, and magnetism can also generate electricity, this sentence is completely true.

Although it is reversible, it is impossible to convert 100% of electricity into magnetism, nor can it convert 100% of magnetism into electricity.

Electrical energy can produce a magnetic field, but a magnetic field can only produce heat.

ElectromagnetismMagnetism can also generate electricity correctly.

According to the Maxwell equation, it can be extrapolated.

A changing electric field produces a magnetic field, and a changing magnetic field produces an electric field. ok？

There is a magnetic field around the current, and there is an electric current around the changing magnetic field

Energy loss should be taken into account.

But it has to be under certain conditions.

There can be no perpetual motion machine with a loss of energy.

There are two ways of magnetism and electricity: induction and kineticism. The changing magnetic field generates an electric field, which causes the closed circuit to produce an induced current, which is induced; The conductor of the closed circuit part cuts the magnetic inductance line to generate an induced current, which is dynamic.

The condition for the induced current is that a part of the conductor is moving in the magnetic field to cut the magnetic inductance lines, that is, the direction of the conductor's movement in the magnetic field is not parallel to the direction of the magnetic inductance lines.

The circuit is closed, and the two ends of the conductor that do the cutting of magnetic inductance lines in the magnetic field generate an induced voltage, which is a power supply If the circuit is closed, an induced current will be generated in the circuit If the circuit is not closed, there is an induced voltage at both ends of the circuit, but there is no induced current in the circuit.

Generation of induced currents:

The magnetic field lines with a uniform magnetic field are perpendicular to the paper surface downward, and the conductor is flat on the paper surface, with the direction due south and north, and the direction of movement is west.

When the conductor moves westward, it can be regarded as the relationship between the direction of the charge in the magnetic field and the direction of the magnetic field and the direction of the charge's movement.

The left-hand rule can be determined: extend the left hand so that the thumb is perpendicular to the other four fingers and all in the same plane as the palm, place the hand into the magnetic field, let the magnetic lines perpendicular to the palm, and point the four fingers in the direction of the charge's motion (west).

Magnetic Electricity - Induction Power Generation: E=N δ T Direction: Lenz's Law Cutting (Magnetic Inductance Line) Power Generation:

e=nblv Direction: Left Hand Rule Rotation ** Electricity: en=nbsw Direction:

The right-hand rule principle The first one is to change the strength of the magnetic field, and the last two are to cut the magnetic inductance lines in part of the closed circuit.

As long as the magnetic flux changes.

Electric charges are everywhere and are classified as moving or not.

The moving charge can make the moving charge have a force, at this time we call the moving charge around the magnetic field, it can be seen that the essence of magnetism is that electricity is made of a circle and not magnetically generated electricity, but the charge of motion can make other moving pure collapse charges gather in a certain direction, so there is electricity. It can be seen that electricity generates electricity, and magnetism is just a "transitional concept" that we use when analyzing problems.

The earliest man-made power sources were due to Galvani's discovery of bioelectricity, while voltaic made voltaic stacks. However, such a power supply was unstable, and it was not until Faraday discovered electromagnetic induction and built a generator that there was a stable power supply.

The principle of cutting the magnetic inductance line to generate an electric current is:

Matter is composed of positively charged nuclei and negatively charged electrons, when the conductor cuts the magnetic inductance line, the positive and negative charges inside the conductor will be forced, but they are forced in opposite directions, at this time the nucleus occupies a few of the mass of all conductors, and the particles with positive and negative charges conform to the conservation of momentum, so the phenomenon of the nucleus moving and the electrons moving.

Therefore, in fact, after understanding this content, the left hand is the same as the right hand, both of which are moving charges and are stressed in the magnetic field.

Electromagnetic Induction:

If a part of the conductor in a closed circuit moves in a magnetic field to cut magnetic inductance lines, the electrons in the conductor will be subjected to the Lorentz force, which is a non-electrostatic force that can cause a potential difference and generate an electric current.

The direction of the induced current can be right-handed rule, and the word "force" can be found to be left-handed, so use the left hand; And the word "electricity" is right-handed, so use the right hand to memorize the mantra: left to force right electricity judgment, which was first discovered by Faraday.