why the magnetic coil is energized

Open Category: Amp RULE

 With internal core, the use of a current through a coil it like a magnet with a magnetic device called a solenoid, English Scientific name: Solenoid usually made from strip or

Horseshoe. Core magnetic systems magnetization easy to use, and easy to disappear magnetic soft iron or silicon to the system to do. Such a magnetic solenoid when energized, power outages after disappeared. Electricity

Magnet has many advantages: the presence or absence of magnetic solenoid, you can use pass, off current control. The size of the magnetic strength of the current can be used or the number of turns of the coil to the control, but also can be changed

Variable resistance control current to control the size of magnetic size. Electromagnets in everyday life has an extremely wide range of applications. Electromagnet is a current magnetic effect (electrophysiological magnetic) of a

Applications, and life are closely connected, such as electromagnetic relays, electromagnetic crane, magnetic levitation trains.
Solenoid with internal core called electromagnets. When inserted into the core inside the solenoid is energized, the solenoid is energized the magnetic core magnetization. Magnetized core also

Into a magnet, so that the two magnetic fields overlap each other, so that a magnetic solenoid greatly enhanced. For the electromagnet magnetic stronger core system usually

Into a horseshoe. But note that the coil wound on the core horseshoe opposite, while clockwise to counter-clockwise on the other side. If around the same two coils on the core magnetization for

Using the offset each other, so that no significant magnetic core. In addition, the electromagnet with a soft iron core to do, rather than using steel to do. Otherwise, once the steel is magnetized, it will maintain long-term

Magnetic and not demagnetized, then the strength of the magnetic current can not be used to control the size, and lose the advantages of the electromagnet should
The invention of the electromagnet

In 1822, French physicist Arago and Gay-Lussac found that when the current through the winding which has iron, it can make the iron wire magnetized. This is actually the power-

Magnet principle was originally discovered. 1823, Sturgeon also did a similar experiment: He is not in a U-shaped iron bar magnet stick on bare copper around the 18 laps, when

Copper and voltaic cell is turned on, around the U-shaped iron rods the copper coils which produce a magnetic field intensity, so that the U-shaped iron rod into a piece of "electromagnet." Such electrical

Magnetic energy than the permanent magnet can be big release times, it can pick up more than 20 times its weight of iron, and when the power is cut off, U-shaped iron bar on what iron also suck live, re-

Become an ordinary iron bar.

Sturgeon electromagnet invented to make people see the magnetic energy to electrical energy into the bright future of this invention soon in the United Kingdom, cup magnet the United States and some Western European countries biography of coastal

Sowing open.

1829, U.S. scientist Henry Sturgeon electricity electromagnet device made some innovations, insulated wire instead of bare copper wire, copper wire so do not worry about being too close to

The short circuit. As the wire with the insulation layer, they can be tightly wound together around the enclosure, the more intensive the coil, the stronger the magnetic field, so that a large

Large increase the capacity of magnetic energy into electrical energy. To 1831, Henry trial out an update electromagnet, although its volume is not large, but it can pick up a

Tons of iron.

The invention also enables the electromagnet generator power has been greatly improved.

Electromagnet Description: DC solenoid and electromagnet can be divided into two major types of AC solenoids. If in accordance with the purpose to divide the electromagnet can mainly be divided into the following five categories: (

1) traction magnet - pulling mechanism is mainly used to open or close the valves, in order to perform automatic control tasks. (2) lifting magnet - used as a lifting

Lifting device ingots, steel, iron ore and other ferromagnetic materials. (3) brake solenoid - mainly used for braking the motor in order to achieve accurate parking purposes.

(4) Automatic electrical electromagnetic system - such as electromagnetic relays and contactors electromagnetic system, automatic switch and operation of the electromagnetic solenoid release and so on. (5) Others

Way solenoid - such as grinder magnetic chuck and electromagnetic vibrator.

Amps RULE
Open Category: Physics

RULE
Represent current and current excitation magnetic field in the direction of the relationship between the sense line is set, also known as the right-hand screw rule.
(1) powered straight wire is given in amperes (amps RULE a): with the right hand holding the straight wire is energized so that the thumb pointing direction of the current, then four fingers pointing is

The direction of the magnetic induction lines surround
(2) Solenoid is given in amperes (amps given the two): with the right hand holding the solenoid is energized, the four fingers bent and current in the same direction, then under the thumb

That end of the N pole of the solenoid is energized

Nature
Line current in amperes given then for a short straight line current also apply. Ring current line currents can be seen as composed of many small pieces, each with a short straight line current current

The amp is determined given the central axis of the ring current direction of magnetic induction. Get up on the ring current superimposed central axis direction of magnetic field lines. Linear current

Amp setting is basic, the ring current in amperes can be determined by a straight line current in amperes is exported straight current in amperes given the linear motion of the charge for the magnetic field generated

Also applies, when the current direction is the same moving direction and the positive charge and negative charge movement in the opposite direction.
The HC Oersted magnetic effect of current experiments and other series of experiments, inspired, A.-M. Amp recognize the essence of current magnetic phenomena, to involve current, magnet

The various interactions between the current attributed to the interaction, for searching for the current element of the basic problems of interaction law. In order to overcome the current element can not be directly isolated

Measurement difficulties, amps designed four experiments showing zero and accompanied by thorough theoretical analysis of the results obtained. However, due to electromagnetic effects amp holding action at a distance concepts

, Was imposed in the theoretical analysis of the two current elements along the connection between the force assumptions, expectations obeys Newton's third law, the conclusion is wrong. The above formula is rejecting the erroneous

The assumption that the force along the connection, the amended result. Close-up view of the role should be understood as the current element produces a magnetic field, the magnetic field on which the current element subjected for another

Force.
Ampere's law, the Coulomb's law rather, the magnetic effect of the basic experimental laws, which determines the nature of the magnetic field, the way of calculating the current interaction.

Ampere force formula
Current element I1dι right away γ12 current element I2dι another force df12 is:

μ0 I1I2dι2 × (dι1 × γ12)
df12 = -------------
4π γ123
Where dι1, dι2 direction is the direction of current; γ12 pointing I2dι from I1dι radius vector. Ampere's law can be divided into two parts. One is the current element Idι

(I.e. the I1dι) in γ (i.e. the γ12) magnetic field generated at
μ0 Idι × γ
dB = -------
4π γ3
This is the Bi - Sa - Pull the law. The second is the current element Idl (ie above I2dι2) in a magnetic field B, the force exerted df (ie above df12) as follows:
df = Idι × B