What is the power factor of a series circuit with 3 ohm resistance and 4 ohm inductive reactance

This vector just forms a triangle with three sides of 3,4,5, and the power factor COS is 0.6, that is, the power factor 3 / 5 = 0.6

If a 1 ohm resistor and several 1000 ohm resistors are connected in series, what is the total resistance of the circuit?

A 1 ohm resistor and several 1000 ohm resistors are connected in series. The total resistance of the circuit is 1 ohm + n 1000 ohm

In symmetrical three-phase circuit, the line voltage is 100V, the three-phase load is triangle connection, the load resistance of each phase is 8 ohm, the inductive reactance is 6 ohm, and the capacitive reactance is 0,
Then the line power factor is ()
A 0.4 B 0.6 C 0.8 D 1.0

The power factor of each phase is 8 / sqrt (8 * 8 + 6 * 6) = 0.8. The total power factor is also 0.8. The answer is C

The formula of line current with 100V resistance 8ohm inductive reactance 6ohm capacitive reactance zero

If the voltage is 100V DC, I = u / r = 100 / 8 = 12.5A

Judging the rotation direction of the small magnetic needle in the magnetic field of the electrified wire
For example, a section of electrified wire is placed horizontally, and the small magnetic needle is placed horizontally and parallel to the wire. When the current is left or right, how does the small magnetic needle rotate? I know to use the right-hand rule to judge the magnetic field, but the annular magnetic field has no fixed N pole and S pole. How to judge the deflection direction of the small magnetic needle? That is, the N pole of the small magnetic needle should point to the wire or deviate from the wire

Magnetic induction line of ring current magnetic field: the current flowing through the ring conductor is called ring current for short. From the distribution of magnetic induction line of ring current magnetic field, we can see that the magnetic induction line of ring current is also some closed curves, and these closed curves also surround the electrified conductor. The direction of magnetic induction line of ring current also changes with the direction of current, We are mainly concerned about the magnetic field direction of each point on the ring axis, which can be judged by the right hand rule: let the four fingers bent by the right hand be consistent with the direction of the ring current, and the direction pointed by the straight thumb is the direction of the magnetic induction line on the ring axis

What is the conclusion of the experiment of the effect of magnetic field on the electrified wire?

The experimental results are as follows
The direction of force on the conductor in magnetic field is related to the direction of magnetic induction line
Hope to help you, if you have any questions, you can ask~~~
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The experiment of magnetic field on the electrified wire
This experiment confirms that the direction of magnetic force on the conducting wire in the magnetic field is related to the direction of current and magnetic field
So what's the point of application?

Application: Motor
The motor is made according to the principle that the electrified coil rotates in the magnetic field

The magnetic field has a strong effect on the conducting wire. Does the conducting wire have an effect on the magnetic field?
Isn't there a magnetic field around the electrified wire? Does it affect the magnetic field when the wire is put into the magnetic field?

According to my understanding, it means that two magnets are close to each other, and there will be interaction between the magnetic poles. Therefore, the magnetic field will be affected by the magnetic field put into the electrified wire

What is the meaning of "the action of force on an electrified wire in a magnetic field"?

"The action of force on an electrified wire in a magnetic field"
It is an electrified wire. If the wire is placed in a magnetic field, the wire will be subjected to the force of the magnetic field on the wire (i.e. magnetic force). It can also make the wire move

On the force acting on an electrified conductor in a magnetic field
There is an experiment in the book to study the direction of motion of an electrified wire in a magnetic field. I can use the left-handed rule to judge this. I already understand this, but I don't know the scientific truth. Why does an electrified wire move in a magnetic field and have different directions?

The force on an electrified conductor in a magnetic field is called ampere force
1. An Peili
If the length of the conductor L, the current I, is perpendicular to the magnetic field, the magnetic induction is B, the magnitude of the ampere force is f = bil, the direction of the ampere force is judged by the left hand rule: stretch out the left hand, point the four fingers to the direction of the current, let the magnetic line of force pass through the palm of the hand, and the direction of the thumb is the direction of the ampere force
2. The cause of Ampere force
There is a current in the conductor, that is, the electrons are moving, and the moving charge will be subject to Lorentz force in the magnetic field. The macroscopic expression of Lorentz force of a large number of electrons is ampere force
The detailed discussion is as follows:
←I
⊙→V
↓
B
As shown in the figure, ⊙ is the electron, the velocity V direction is to the right, the Lorentz force is EVB, the direction is judged by the right hand rule, the four fingers bend from V to B, the thumb direction is the direction where the positive charge is affected by the Lorentz force, but because the electron is negatively charged, the direction of the Lorentz force is just the opposite, and the vertical screen points to us;
If the electron moves to the right, the current will move to the left
I've said so much. I don't know if you understand

What is the power factor of a series circuit with 3 ohm resistance and 4 ohm inductive reactance