Work,+energy,+and+power

**Work** can be defined as transfer of energy. In physics we say that work is done on an object when you transfer energy to that object. If one object transfers (gives) energy to a second object, then the first object does work on the second object. Work is the application of a force over a distance. Lifting a weight from the ground and putting it on a shelf is a good example of work. The force is equal to the weight of the object, and the distance is equal to the height of the shelf (W= Fxd). __Work-Energy Principle__ --The change in the kinetic energy of an object is equal to the net work done on the object. **Energy** can be defined as the capacity for doing work. The simplest case of mechanical work is when an object is standing still and we force it to move. The energy of a moving object is called kinetic energy. 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. **Types of Energy** There are two types of energy in many forms: __Kinetic Energy__ = Energy of Motion __Potential Energy__ = Stored Energy Solar Radiation -- Infrared Heat, Radio Waves, Gamma Rays, Microwaves, Ultraviolet Light Atomic/Nuclear Energy -energy released in nuclear reactions. When a neutron splits an atom's nucleus into smaller pieces it is called fission. When two nuclei are joined together under millions of degrees of heat it is called fusion Electrical 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). Chemical Energy --Chemical energy is a form of potential energy related to the breaking and forming of chemical bonds. It is stored in food, fuels and batteries, and is released as other forms of energy during chemical reactions. Mechanical Energy -- Energy of the moving parts of a machine. Also refers to movements in humans Heat Energy -- a form of energy that is transferred by a difference in temperature **What is Power** <span style="font-family: Arial,Helvetica,sans-serif;">Power is the work done in a unit of time. In other words, power is a measure of how quickly work can be done <span style="font-family: Arial,Helvetica,sans-serif;">. <span style="font-family: Arial,Helvetica,sans-serif;">The unit of power is the Watt = 1 Joule/ 1 second. <span style="font-family: Arial,Helvetica,sans-serif;">One common unit of energy is the kilowatt-hour (kWh). If we are using one kW of power, a kWh of energy will last one hour. <span style="font-family: Arial,Helvetica,sans-serif;">**Calculating Work, Energy and Power** <span style="font-family: Arial,Helvetica,sans-serif;">WORK = <span style="font-family: Arial,Helvetica,sans-serif;">W=Fd <span style="font-family: Arial,Helvetica,sans-serif;">Because energy is the capacity to do work, we measure energy and work in the same units (N*m or joules). <span style="font-family: Arial,Helvetica,sans-serif;">POWER (P) is the rate of energy generation (or absorption) over time: <span style="font-family: Arial,Helvetica,sans-serif;">P = E/t <span style="font-family: Arial,Helvetica,sans-serif;">Power's SI unit of measurement is the Watt, representing the generation or absorption of energy at the rate of 1 Joule/sec. Power's unit of measurement in the English system is the horsepower, which is equivalent to 735.7 Watts.
 * <span style="font-family: Arial,Helvetica,sans-serif;">Definitions **
 * <span style="font-family: Arial,Helvetica,sans-serif;">Forms of Energy **