Why aren't the cards divided into positive and negative? If it's because the AC is going to change, does it go from fire to zero during the positive half cycle, and from zero to fire during the negative half cycle? ? If not, does electricity still flow from the live wire? It's just that the electricity is much greater during the positive half-cycle, and the electricity is much smaller during the negative half-cycle. If so, why don't the files do this? be divided into positive and negative?
First, the voltage and direction of alternating current are constantly changing. You said: "Why aren't the plugs divided into positive and negative? If it changes because of alternating current, does it change from fire to positive? during the positive half cycle? Zero , from zero to hot in the negative half-cycle." Therefore, alternating current has no positive or negative distinction. Heis simply divided into active and neutral lines. What you say next is incorrect.
Second, only direct current can be divided into positive and negative, because the direction of voltage and current is always the same. Therefore, do not confuse the live wire, the neutral wire and the positive and negative poles.
The advantages of alternating current are mainly reflected in the production and distribution of energy: use of an alternator based on the principle of electromagnetic induction, mechanical energy (flow energy of the water, wind energy, etc.), chemical energy (oil, natural gas, etc.) and other forms of energy can be converted into electrical energy; AC power supplies and AC substations are much cheaper than DC power supplies, and DC converter stations with the same power can be easily scaled up and down; thanks to transformers, which provides great cconvenience in the distribution of electrical energy. This is a unique advantage of alternating current over direct current.
When transmitting the same power, the wires used in DC transmission are only 2/3~1/2 of the AC transmission.
DC transmission adopts a two-wire system, with earth or seawater as the return line. Compared with three-phase three-wire AC transmission, under the conditions of the same transmission line carrying area and current density, even without considering the skin effect, the same electric power can be transmitted . , and the transmission line and insulation materials can be saved by 1/3．
If the skin effect and various losses (dielectric loss of insulating materials, eddy current losses of magnetic induction, corona losses of overhead lines, etc.) are taken into account, the section transversal of the wire used to transmitbe the same AC power is greater than or equal to DC 1.33 times the cross section of the wire used for power transmission. Therefore, the wires used in DC transmission are almost half of those used in AC transmission. At the same time, the structure of DC transmission towers is simpler than that of three-phase AC transmission with the same capacity, and the line corridor occupies less area.
How many live wires does the 10 year old Jetta generator have?
Vehicle generators can generally be divided into two types. One is the former. this requires an external voltage regulator In addition to the positive (thick) terminal on the generator end cover, there are also (thin) terminals for connecting the regulator. The other is a new guy. The voltage regulator is installed in the end cover of the generator. There is only one positive terminal onthe end cover of the generator. Simply connect the generator shell to the motor.
The 10 year old Jetta does not have a generator with a live wire. The alternator cable on the old Jetta is just one line, behind the alternator. This car generator is a micro-magnetic generator. The positive lead of this car's alternator is connected through the mounting table, and the positive lead is connected to the charging light.
Operating principle of the car alternator
The operating principle of the 'overall alternator, when When the external circuit feeds the excitation winding through the brush, a magnetic field is generated, causing the claw poles to be magnetized into N and S poles. When the rotor rotates, the magnetic flux changes alternately in the stator winding. According to the principle of electromagnetic induction, wecan see that an alternating induced electromotive force is generated in the three-phase winding of the stator. This is how an alternator produces electricity.
The main motor, i.e. the motor, drives the rotor of the synchronous generator excited by direct current to rotate at a speed n (rpm), and the stator winding three-phase induces an alternating potential. If the stator winding is connected to an electrical load, the motor will produce alternating current. The alternating current will be converted to direct current through the bridge rectifier inside the generator and output from the output terminal.
The alternator is divided into two parts: the stator winding and the rotor winding. The three-phase stator winding is distributed across the housing at an electrical angle difference of 120 degrees to each other. is composed of two polar claws. When the rotor winding is connected to direct current, it is energized andthe two polar claws form the N pole and the S pole. The magnetic lines of force start from the N pole, enter the stator core through the air gap, and then return to the adjacent S pole.