How to change 220 V AC into 380 V AC

How to change 220 V AC into 380 V AC

Low voltage 220, high voltage 380. We use 220 in our daily life, but the factory uses 380. They all come from the same line. The difference is that we have one live wire and one zero wire, while the factory has two live wires. If you want to use 380 at home, you can only change the voltage. If the factory connects two live wires of different phases, it will do. Do you understand? The power generated by the power plant is transmitted by three live wires, There is a phase difference of 120 degrees between each wire. The voltage between two live wires is 380, and the voltage between live wire and ground is 220

After three-phase 380V to three-phase 220V, can two phase wires of three-phase 220V be connected to the lighting of 220V

Can use, the same voltage, the same frequency, on the line

The voltage of sinusoidal current for lighting is 220 V, what are its effective value and peak value?

The effective value of sinusoidal current and voltage is u = 220 V & nbsp; & nbsp; peak value um = 2 u = 220 V = 311 V & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; answer: the effective value and peak value are 220 V and 311 V respectively

A simple method: 199 + 99 * 99

199+99x99
=100+99+99x99
=100+99x(99+1)
=100+99x100
=100+9900
=10000

Factorization: ax + 2A + a cube,
Factorization: ax + 2A + a cube,

A (x square + 2A + a square) can be obtained by extracting a, and then it can be changed into the complete square formula a (x + a) square

What is 5 / 4 minus 1 / 2?

3/4

Glue three cubes with a surface area of 24 square centimeters into a cuboid (as shown in the figure), and calculate the surface area of the cuboid. If six cubes are used to make a cuboid, how many square centimeters is the surface area of the cuboid?

24 △ 6 = 4 (square centimeter), 24 × 3-4 × 4, = 72-16, = 56 (square centimeter), 24 × 6-4 × 10, = 144-40, = 104 (square centimeter), a: the surface area of this cuboid is 56 square centimeter. If six pieces of this cube are used to make a cuboid, then the surface area of the cuboid is 104 square centimeter

Fraction = 0.75 = twenties = how much divided by 12

3 / 4 = 0.75 = 15 / 20 = 9 divided by 12

How many numbers in 1-1000 can be divided by 2, 3 or 5?
Urgent! This question will be invalid before September 14, 2012!
Update: this question will be invalid after September 14, 2012!

Divided by 2, i.e. how many groups of two numbers are there, 1000 / 2 = 500 (\ \ means to take the integral part after division)
Divided by 3, i.e. how many groups are there in the number of three places, 1000-3 = 333
Divided by 5, i.e. how many groups are there in the number of five places, 1000-5 = 200
Divided by 2 and 3 at the same time, that is, six six places, 1000-6 = 166
It is divided by 2 and 5 at the same time, that is, the number of ten places, 1000-10 = 100
Divided by 3 and 5 at the same time, i.e. 15 numbers, 1000-15 = 66
It is divided by 2, 3 and 5 at the same time, that is, the number of 30 sites, 1000-30 = 33
Among the above conditions, 500 + 333 + 200-166-100-66 + 33 = 734
(the numbers of 2, 3 and 5 have been repeatedly subtracted and divided at the same time, so 33 has to be added in the end.)

What is 35 out of 36 divided by 5 out of 8

35/36÷5/8
=35/36×8/5
=14/9