What is power?

power is the object work done per unit time, i.e., the speed of power is described physical work. A certain number of power, the shorter the time, the greater the power value. The formula for the power demand power = Power / Time

1. Noun interpretation power

power is the object work done per unit time, i.e., the speed of power is described physical work. A certain number of power, the shorter the time, the greater the power value. The formula for the power demand power = work / time.

2. Detailed power

English name: Power

Definition 1: work done per unit time, or transfer or conversion of energy per unit time.

Applications Subject: power (a subject); General Theory (two subjects)

Definition 2: work done per unit time.

Applied science: Water Science and Technology (a subject); mechanical engineering, structural engineering, building materials (two subjects); Engineering Mechanics (Water Resources) (three subjects)

greater power the higher the speed, the higher the maximum speed of the vehicle, the maximum power used to describe the car’s dynamic performance. The maximum power is generally used metric horsepower (PS) or kilowatts (kW) to represent, 1PS equal 0.735kW.

physics we learned formula: W = F · s, it tells us that the work requires two conditions, one is strong, and second displacement along the direction of the force. The power unit of time is to do the work, P = W / t, that is P = F · s / t, while s / t is the speed, it would appear that if the force under the same circumstances, want more reactive power in the key rate. .

3 with respect to power measurement techniques

measured power There are four methods P:

● diode detector power law;

[123 ] ● equivalent heat consumption subjectMeasurement method;

● True RMS / DC (TRMS / DC) conversion power detection method;

● power logarithmic amplification detection method.

4. The power to the various names

power is a physical quantity showing the speed of an object work, physics reactive power P = W / time t, is Watt w, we often in the media power saw units kw, ps, hp, bhp, whpmw the like, as well as with the previous Italian CV, where the edge is the SI unit kW kW, 1kW = 1000W, 1000 joules 1 second finish work, the power It is 1kw. Daily life, we often known as horsepower power unit is horses, just as the torque called torque.

In the car top, the greatest work machine is a power engine, the engine is the torque calculated, and the formula is quite simple: Power (w) = 2π × torque (Nm) × (rpm) speed / 60, to simplify the calculation becomes: power (W) = torque (Nm) × speed (rpm) /9.549.

Depending on the metric and English, defined substantially not the same horsepower. Imperial horsepower (hp) is defined as: a horse in one minute to 200 lbs (LB) pulling heavy objects 165 feet (ft), after multiplication equals 33,000lb-ft / min; and metric horsepower (PS ) was defined in a horse pulls a minute object 60 meters 75kg, after multiplication equal 4500kg.gm/min. After singleBit conversion, (1lb = 0.454kg; 1ft = 0.3048m) actually found 1hp = 4566kgm / min, and the metric 1PS = 4500kg.gm / min slightly different, but if the watt units (1W = 1Nm / sec1 / 9.8 kg.gm/sec) to convert into, available 1hp = 746W; 1ps = 735W, two different results, a difference of about 1.5 weight percent.

The new standard EEC DIN Germany and the European Community have JIS in Japan is metric horsepower unit for the PS, and SAE hp using imperial units, but due to the integration of the world economy and the advent of order avoid complicated conversion, more and more of the original data has been changed to provide power value undisputed international standards as per kW kW engine output.