Some questions about electricity, high people come!

1. Metals conduct electricity by electrons, and solutions conduct electricity by ions.

2. Poor contact is an open circuit, and short circuit is a short circuit of part of the circuit.

3. The sum of the current of each branch of the series circuit is equal to the total current, the ratio of voltage is the inverse ratio of the resistance ratio, the voltage of each branch of the parallel circuit is the same, and the ratio of current is the inverse ratio of the resistance of each branch.

4. The nucleus of the hydrogen atom (Cypium) does not contain neutrons.

5. An atom is composed of a nucleus and electrons outside the nucleus.

1。"Metallic conduction" is free electrons, and "solution conduction" is positive and negative ions.

2。"Poor contact" is sometimes open and sometimes broken, and "short circuit" is a short circuit.

3。"Series Circuit".

The currents are all equal.

The total voltage is equal to the sum of the partial voltages.

The total resistance is equal to the sum of the resistances of the various series conductors.

The parallel circuits "are all equal in voltage."

The sum of the currents of each branch is equal to the total current.

The reciprocal of the total resistance is equal to the sum of the reciprocals of the parallel conductors.

4。The nucleus of the "hydrogen" atom does not contain neutrons and has only one proton.

5。Atoms are made up of "nuclei and extranuclear electrons", and "nuclei" are made up of protons and neutrons.

1.Metal conduction is the movement of electrons, and solution is ionized ions.

2.Poor contact can be considered as the addition of a large resistance, and a short circuit means that the resistance is zero.

3.The series currents are equal, and the parallel voltages are equal.

4.Hydrogen atoms.

5.Atoms are, nuclei and electrons composed.

1.Electron 2There are three states: short circuit, pathway, and open circuit.

3.The load voltage of each load in the series circuit is different and the current is the same.

The current of each load in the parallel circuit is different, the voltage is the same, in a word, the series voltage divider, the parallel shunt.

4.You don't know the difference between the nucleus and the molecule, the molecule is the definition of the atom, and the nucleus is the core of the atom.

5.An atom consists of a nucleus and an electron.

1. There are freely moving electrons in the conductor; There are freely moving ions in the solution.

2 Open circuit; Short circuit.

3 strings: the currents are equal everywhere, and the voltages everywhere are added to the total voltage; And: The voltages of each branch are equal and the branch currents are added to the total current.

4 Hydrogen atoms.

5 neutrons protons and extranuclear electrons.

1. Free electron ions.

2.Open circuit (open circuit) Short circuit.

3.String: The currents are equal and the voltages are added.

And: The voltages are equal and the currents are added.

4.Hydrogen atom (氕).

5.Protons, neutrons, extranuclear electrons.

I have all of them in the book, and I will flip them through by myself!!

1. Metal conductivity is electron, and the solution is ionized ions.

2. Poor contact is an open circuit, and short circuit is zero resistance.

3. The series current is equal, and the voltage is proportional to the resistance. The parallel voltage is equal, and the current is inversely proportional to the resistance.

4 Hydrogen atoms. 5 protons, neutrons, electrons.

1. Power dispatching is an organization within the power system, that is, the power grid dispatching agency. That is, the power generation, power supply, and electricity operation organization, command, guidance, and coordination center of the power grid.

2. The power supply station is a power supply enterprise at the township level, which is responsible for the power supply management and service of the township.

3. The power station is a place where other energy is converted into electrical energy.

4. The substation is to boost or lower the power generated for transmission, and the purpose of the boost is to reduce the loss of the line.

5. The power plant is also a place where electricity is generated.

6. The scope of electricity management is too wide, the employees of the power system can be called the pipe electricity, you may be talking about repairing the circuit in a small area, reading meters, ensuring the normal power supply of people, and there is also a person called an electrician.

There is no picture and no truth.

But I already know the picture.,Is this it?

If it is, you can hear the light clearly: when the switch is closed, the lamp L goes out, either the circuit is broken, or the lamp l is short-circuited, and the title says that it only happens on the lamp and the resistor, so there are three cases, the lamp l is short-circuited, the lamp L is open, and the resistance is broken.

If it is a resistor open circuit, there is no indication of the two meters, and the bridge is blind and smaller, which does not meet the topic.

If the lamp L is short-circuited, the voltmeter measures the voltage at both ends of the wire, and the indication is 0, and the current in the circuit increases, which is in line with the two-wheel eggplant meter one increase and one decrease.

If the lamp l is open, the ammeter has no indication, and the voltmeter measures the power supply voltage, which is in line with one increase and one decrease.

So both of the above possibilities are true.

When the lamp and resistor are replaced, both meters must be deflection.

Dual-purpose electrical appliances are closed after transposition, and the voltmeter measures the voltage at both ends of the resistance, and when the lamp L is short-circuited, the current in the circuit becomes larger, and the voltage also has an indicator.

When the lamp l is broken, there is no indication for both meters.

So choose the lamp l short circuit.

Turn left|Turn right.

A three-phase motor can be considered as a three-phase symmetrical load, and the current does not flow back from the neutral line. Rather, the three of them form a circuit with each other.

Because the three-phase alternating current changes according to the sinusoidal law, and their phases are 120 degrees different from each other, which is symmetrical. At any given moment, if at least one phase is in the opposite direction to the other two phases, then this phase is actually a loop of the other two phases, and the vector sum of the three phases is 0, i1 + i2 + i3 = 0. So when the load is symmetrical, there is no current in the neutral line!

I can only say it so simply, I hope you can understand a little!

Whether single-phase or three-phase, the neutral line is a path for current, not a protective one. It's just that in a three-phase system, if the three phases are balanced, the current at the neutral line will be 0.

In China's low-voltage system, the neutral line is grounded at the neutral point of the transformer, and the neutral line may also be re-grounded on the power supply line. You're talking about the ground wire.

Maybe you're just getting started with these things! Usually electricity, alternating current is not divided into positive and negative! Don't separate the positive half of the alternating current from the negative half of the wave!

The neutral line from the transformer is not for protection! There is no zero line on the three-phase motor, and the grounding wire connected to the shell is only for protection! You have to explain this question to you clearly, and you have to write a long paragraph!

You go and read the book first, don't see the slightest bit and ask if you don't understand! You may not be able to figure it out for a while!

The first question is wrong, there is voltage and there is not necessarily current. For example, there is only an open circuit voltage, and there is no current because the open circuit cannot form a path.

What if you answer these questions correctly?

Known ,..

Seeking: ...Solution: i1=10 000*3 10 000=3 (a) i2=10 000*3 220= (a).

i1n=50 000/10 000=5 （a） i2n=50 000/220= （a）

A: ...I'm lazy, you won't blame me. ）