Power equals work (J) divided by time (s). The SI unit for power is the watt (W), which equals 1 joule of work per second (J/s).

Electrical Energy: The Watt If voltage, (V) equals Joules per Coulombs (V = J/C) and Amperes (I) equals charge (coulombs) per second (A = Q/t), then we can define electrical power (P) as being the totality of these two quantities. This is because electrical power can also equal voltage times amperes, that is: P = V*I.

This theory predicts that the most likely coalition to form in a group will be one that wins but comprises the individuals with the smallest amounts of power consistent with this outcome. …

The power input of a centrifugal pump (pump input power) is the mechanical power taken by the pump shaft or coupling from the drive. The SI unit of measurement for power input is watts (W).

Two types of power supplies exist, DC-DC and AC-DC.

Most power supplies are made up of four basic sections: a TRANSFORMER, a RECTIFIER, a FILTER, and a REGULATOR.

watt

Knowing what the word “power” means to physicists helps you understand the units of power. In the SI (metric) system, the units are watts. When measuring in the Imperial system, the units are either foot-pounds/second or horsepower. One horsepower is equal to 550 foot-pounds/second.

In words: Work is equal to the force that is exerted times the distance over which it is exerted. In equation form: work (joules) = force (newtons) x distance (meters), In the metric system of units, where force is measured in newtons (abbreviated N), work is measured in newton-meters (N-m).

In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second.

Energy is what makes change happen and can be transferred form one object to another. Power is the rate at which energy is transferred. It is not energy but is often confused with energy. The watt is the most commonly used unit of measure for power.

Electricity is both a basic part of nature and one of the most widely used forms of energy. The electricity that we use is a secondary energy source because it is produced by converting primary sources of energy such as coal, natural gas, nuclear energy, solar energy, and wind energy, into electrical power.

Many forms of energy exist, but they all fall into two basic categories:

• Potential energy.
• Kinetic energy.