Power's unit of measurement in the English system is the horsepower, which is equivalent to 735.7 Watts. Power's SI unit of measurement is the Watt, representing the generation or absorption of energy at the rate of 1 Joule/sec. ![]() POWER (P) is the rate of energy generation (or absorption) over time:P = E/t If we are using one kW of power, a kWh of energy will last one hour.īecause energy is the capacity to do work, we measure energy and work in the same units (N*m or joules). One common unit of energy is the kilowatt-hour (kWh). In other words, power is a measure of how quickly work can be done. The unit of power is the Watt = 1 Joule/ 1 second. Power is the work done in a unit of time. Heat Energy - a form of energy that is transferred by a difference in temperature Mechanical Energy - Energy of the moving parts of a machine. It is stored in food, fuels and batteries, and is released as other forms of energy during chemical reactions. When two nuclei are joined together under millions of degrees of heat it is called fusionĮlectrical Energy -The generation or use of electric power over a period of time expressed in kilowatt-hours (kWh), megawatt-hours (NM) or gigawatt-hours (GWh).Ĭhemical Energy -Chemical energy is a form of potential energy related to the breaking and forming of chemical bonds. When a neutron splits an atom's nucleus into smaller pieces it is called fission. Solar Radiation - Infrared Heat, Radio Waves, Gamma Rays, Microwaves, Ultraviolet LightĪtomic/Nuclear Energy -energy released in nuclear reactions. There are two types of energy in many forms: For an object of mass m, moving with velocity of magnitude v, this energy can be calculated from the formula E= 1/2 mv^2. The energy of a moving object is called kinetic energy. The simplest case of mechanical work is when an object is standing still and we force it to move. Work-Energy Principle -The change in the kinetic energy of an object is equal to the net work done on the object.Įnergy can be defined as the capacity for doing work. ![]() The force is equal to the weight of the object, and the distance is equal to the height of the shelf (W= Fxd). Lifting a weight from the ground and putting it on a shelf is a good example of work. ![]() Work is the application of a force over a distance. If one object transfers (gives) energy to a second object, then the first object does work on the second object. In physics we say that work is done on an object when you transfer energy to that object. Work can be defined as transfer of energy.
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