How many degrees is 40 a current equal to one hour

How many degrees is 40 a current equal to one hour

If it is a three-phase symmetrical circuit, it is 22.4 kW, and the power consumption per hour is 22.4 degrees; if it is a single-phase circuit, it is 40A × 220V = 8800w, and the power consumption per hour is 8.8 degrees
How many currents can a square wire carry? One current equals one ampere, right
A current is equal to 1 A. the current carrying capacity of a wire is related to the cross-sectional area of the wire. The larger the cross-sectional area is, the smaller the unit current carrying capacity is, for example, 1 mm, 10 mm, 178 for copper wire, 80 A, 100 mm, 178 for copper wire, 320 a for copper wire, etc
How much wire and leakage switch is needed for 50 kW? How to calculate the formula and coefficient
I want to calculate the electric heating equipment, but I can't estimate it
You didn't say much about the voltage. Tell yourself to calculate:
Power divided by voltage = current
As for wiring: 10 down five, (10x5) 100 up two. (100X2)
25, 35, (25x4) (35x3) four three boundaries
70, 95, twice and a half. (70x2.5, 95x2.5)
Pass through temperature, 20% off
Add half to the bare wire
Copper wire upgrade calculation. (that is to say, the result calculated by copper wire is multiplied by 2, the above said is aluminum wire, and the copper wire here is OK! If you don't understand, you won't say it!)
After calculating the current, you will know how big the switch is!
Remember: the switch cannot be too much greater than the current!
After a copper wire is folded in half and connected to the circuit, the resistance of the copper wire will change to the original value
A. 1 / 2 B.1 / 4 C.2 times
Choose B
The analysis is as follows,
Half fold will lead to half of the length, so the resistance will be reduced by half. At the same time, the cross-sectional area will be doubled, and the resistance will be reduced by half, so it will finally become 1 / 4 of the original
B
Half the length, double the area, B
B
When did edison invent the light bulb?
Swan and Edison invented the incandescent lamp at the same time, but not the electric lamp. In 1808, the British chemist David made the first electric arc lamp in human history; in 1809, the British drura made the first incandescent lamp; from 1809 to 1878, in nearly 70 years, inventors trial produced countless different structures
During the operation of the motor, the electric energy is converted into energy_________ Can and_________ The motor shell is shaped as shown in the figure for___________________________ 
Mechanical energy and thermal energy, motor shell made as shown in the figure is to facilitate heat dissipation
How many copper wires are there in the wire?
How many copper wires are there in the 1 square national standard line? How many wires are there in the 1.52 square one? How to calculate whether the bought line is enough standard square?
1 square 32 root 0.2, 2.5 square 49 root 0.25, the calculation should be the number of root, measure the diameter of each root, calculate the total cross-sectional area
Is the resistance of manganese copper wire high or that of copper wire high?
That depends on the situation. If the two lengths and diameters are the same, the resistivity of manganin is larger than that of copper. You can find the answer in the physics textbook of grade three!
——- Senior One Students
Edison invented the light bulb
It needs to be short
The story of Edison's invention of electric lamp Edison started the experiment of reforming arc lamp in 1877. He proposed to divide the electric current and change arc lamp into white light lamp. In order to achieve a satisfactory result, a substance that can burn white heat must be found to make filament. This kind of filament must withstand the burning of heat at 2000 ℃ for more than 1000 hours
Will mechanical energy be converted into electrical energy when the motor is working?
In electromagnetic induction, it is said that when part of the conductor of the closed circuit cuts the magnetic induction line, the induced current will be generated, that is, the mechanical energy will be converted into electric energy. But the principle of the motor is that the electrified conductor is forced to move in the magnetic field, so it is equivalent to that part of the conductor of the closed circuit is cutting the magnetic induction line, so the induced current will not be generated in the circuit?
Of course, electric energy will be generated, and induction current must be generated. The so-called torque of motor is: the stator generates a rotating magnetic field, so that the rotor generates induction current, and then the charged winding (rotor) generates torque in the moving magnetic field!
There will be, so some servos need external regenerative discharge resistor
There is no induced current. You can use the right hand rule to judge its direction: it is opposite to the direction of the current. Of course, if you turn the rotor by hand, or suddenly turn off the power and the external circuit is closed, it will generate current (permanent magnet DC motor).