Principle of motor and generator?

Principle of motor and generator?

The working principle of motor: the magnetic field of the electrified coil rotates under the force of the magnetic field. (the effect of the magnetic field on the current). It is a device that converts electric energy into mechanical energy
The working principle of the generator: the rotating coil can produce the induced current in the magnetic field. (electromagnetic induction: when a part of the conductor of the closed circuit cuts the magnetic induction line in the magnetic field, the induced current will be produced in the circuit.) it converts the mechanical energy into electrical energy

What is the principle of the second physics motor of PEP?

The basic working principle of the motor is: the electrified conductor is forced in the magnetic field;

Who knows the principle of physical motor and generator, as well as their application! Say the specific point! In a word, all about motor and generator!

Motor principle: simply speaking, it is electricity generating force, namely the magnetic effect of current
Motor application: the motor can be divided into motor for electric tools (including drilling, polishing, polishing, slotting, cutting, reaming, etc.), motor for household appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders, video recorders, vacuum cleaners, cameras, hair dryers, electric shavers, etc.) and other general small mechanical equipment (including various types of motors) A kind of motor for small machine tools, small machines, medical instruments, electronic instruments, etc
Generator principle: simply speaking, motion generates electricity (mechanical energy is converted into electrical energy), namely electromagnetic induction
Generator application: thermal generator (diesel generator, gasoline generator), wind turbine, hydro generator

Physics camera imaging principle
Why is it said that "in daily life, the camera should look for your complete body image, and when looking for your bust, the camera should be close to you, and the lens should be ()" I know this blank is "extended", but I don't know why, if the photographer knows to stay away from the object, what is it like

This is mainly because when the object is close to the camera, the image distance must be far away from the convex lens. In the process of lens extension, the lens is equivalent to the convex lens, and the extension is equivalent to the image distance

If f (x) = 4sin (2x + 1) - x, then A. (1,2) B. (2,3) C. (3,4) d. (4,5) has no zero in the following interval
Can we do without drawing?

We use the zero point theorem to solve. That is, the root existence theorem, that is, if f (a) * f (b)

10-3 (x + 1) = 5-2x is equal to the number of equations

10-3（X＋1）=5-2X
10-3x-3=5-2x
x=2

Given the joint probability density f (x, y) of two-dimensional random variables (x, y), we can find the expectation of random variable x?
Can we do this: first calculate the edge probability density of X, and then calculate the expectation according to one-dimensional random variables?

Yes, that's what I asked for

Find the solution of the equation cosz = 2, Z is a complex number

cosZ=[e^(iz)+e^(-iz)]/2=2
e^(iz)+e^(-iz)=4
Let t = e ^ (iz)
Then, t + 1 / T = 4
t^2-4t+1=0
(t-2)^2=3
t=±√3+2
e^(iz)=±√3+2
Logarithm on both sides
iz=Ln(±√3+2)
=ln(±√3+2)+2kπi
z=-iln(±√3+2)+2kπ

Given that the m-th power of a is 4 and the n-th power of a is 3, find the value of 2m + 3N of A

a^(2m+3n)=(a^m)^2*(a^n)^3=16*27=432

In the square, draw four rectangles and squares with the circumference of 20 cm, but different shapes. The side length of each square is 1 cm

Square: 5x5;
Rectangle: 6x4