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Energy DEFS

first vocab definitions 1-26-10

QuestionAnswer
A quantity that describes the capacity to do work; a source of usable power. Energy
A change of energy from one form to another (e.g., Mechanical to Electrical, Solar to Electrical. Energy Transfer
A form of energy resulting from the temperature difference between a system and its surroundings. Heat
The energy possessed by a body because of its motion. Kinetic Energy
The energy an object has because of its position or structure;stored energy. Potential Energy
The bouncing off of or turning back of light, sound, or heat from a surface. Reflection
A change in direction of a wave that occurs as it passes from one medium to another of different density. Refraction
In any periodic function (e.g., a wave) the maximum absolute variation of the function. Amplitude
Unit of energy; the amount of heat needed to raise one gram of water one degree Celsius at standard atmospheric pressure. Calorie
The transmission of heat through a medium without the motion of the medium. Conduction
Heat transfer in a gas or liquid by the circulation of currents from one region to another. Convection
The change in direction of a wave caused by passing by an obstacle or traveling through an opening. Diffraction
The relative effectiveness of a system or device determined by comparing input and output. Efficiency
A measure of randomness or disorder of a closed system. Entropy
The number of cycles or waves per unit of time. Frequency
Emission of energy in the form of rays or waves. Radiation
Internal energy found by adding the kinetic energy of partials making up a substance. Thermal energy
The lowest point on a wave. Trough
A repetitive around an equilibrium point. Vibration
The distance between crests of a wave. Wavelength
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