Power calculation
P power (kw), f traction (KN), V speed (M / min) in the formula, η Efficiency of transmission machinery
Definition of work: if an object is affected by a force and has a displacement in the direction of the force, we say that the force has done work on the object
Calculation formula of work: w = f * s (where W is work, f is force, s is the distance in the direction of force)definition of power: power refers to the amount of work done by an object in unit time, that is, power is a physical quantity describing the speed of work
Calculation formula of power: P = w / S = f * V (where p is power, W is work, s is distance, f is force, V is velocity) 
extended data:
in one-dimensional motion:
1
If the resultant force on the object is f, and the displacement direction of the initial motion and the final motion is the same as F, then the total work of the object is greater than zero If the resultant force is f, and the displacement direction of initial motion and final motion is opposite to F, then the total work of the object is less than zero Note: there is a difference between the total work and the work of a certain forcepower measurement is used to measure the power consumption of electrical equipment, which is widely used in research and development or proction lines of household appliances, lighting equipment, instrial machines, etc
There are four ways to measure power:(1) diode detection power method
(2) equivalent thermal power consumption detection method (3) true RMS / DC (TRMS / DC) conversion detection power method (4) logarithmic amplification detection power methodbecause regardless of the power factor (which depends on the phase relationship between the current and voltage on the load), the maximum current flowing in the circuit is the real current. The so-called virtual value is just a way to distinguish the current on the resistance, and the virtual current can still burn the line or equipment. Therefore, the power of power circuit (line or equipment) should be calculated according to the current, not the useful power
but the power consumed by the power circuit is still calculated according to the useful power, which is the apparent power × Power factor, because the virtual power will eventually be fed back to the power supply, does not belong to the consumed energy
the power of three-phase electricity is the sum of the power consumed by the three phase lines, regardless of whether the current on the three phase lines is balanced or not (imbalance will increase the extra energy loss of lines and equipment). Unbalanced three-phase electricity only increases the transmission loss of lines and equipment, and does not affect the calculation relationship of power. It is just that the power of one line is multiplied by three when it is balanced, and the power of three lines must be added up when it is unbalanced.
Benchmark formula: 1kW = 1.36 HP, 1 HP = 0.735kw, so 191 × 36 = 260 HP
Horsepower is a unit of power measurement commonly used in engineering technology. Generally refers to metric horsepower rather than British horsepower. It is artificially agreed that 1 metric horsepower is equal to the effort to raise a 75 kilogram object by 1 meter per second
metric horsepower
metric horsepower, its regulation is completely artificial, it takes a very close value to the British horsepower. It is stipulated that 1 metric horsepower is the work of 75 KGF · m in 1 second. That is: 1 metric horsepower = 75 KGF · M / S = 735 watts
British horsepower
British horsepower is used in Britain, the United States and other countries. One British horsepower equals 550 ft. lbs. and 745. 7 watts[ 1] In the late 18th century, British physicist watt (1736-1819) in order to determine the power of a newly manufactured steam engine, he defined horsepower as the work of lifting a 1000 pound weight by 33 feet in one minute. This is British horsepower, expressed by the letter HP
The power formula P = w / T = f * V
to calculate the average power of pulling force F to do work P = f * V
where V represents the average speed of moving object
to calculate the instantaneous power of pulling force F to do work Pt = f * VT
where V represents the instantaneous speed of moving object
the amount of work per unit time. So the power is required to know the magnitude and time of work. The formula of work (W) is w = FS, f is the magnitude of the force, s is the distance that the object passes under the action of the force. So only knowing the force is 20n, there is no way to calculate the power. You also need to know how far and how long it takes to pull the object
extended data:
electric power calculation formula: P = w / T = UI
In the pure resistance circuit, according to Ohm's law, u = IR can be substituted into P = UI to get P = I2R = (U2) / Rin dynamics: power calculation formula: 1. P = w / T (average power) 2. P = FV; P=Fvcos α Instantaneous power)
because w = f (f force) × S (s displacement) (the definition of work), so the power formula can also be derived P = f · V: P = w / T = f * s / T = f * V (this formula is applicable to the uniform linear motion of objects)
where
P: power
A: scavenging area, i.e. a = &; π* R² π= 14159, R is the radius, i.e. blade length)
V: wind speed
CP: a value of wind energy conversion rate. According to the Bates limit, the maximum CP value is 59%. However, at present, manufacturers can not reach this theoretical value. According to different manufacturers' technologies, this value is different, and generally 20-30 or more is rarely achieved. So this value is also important
D: air density, which decreases with altitude
d η： coefficient
P0=E/t=1/2 ρπ R ^ 2V ^ 3
suppose generator efficiency η
the generating power of wind turbine is p = 1 / 2 ηρπ R^2V^3