NATS 1840 Chapter 3: 3.4-Energy
8 Feb 2019
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The work needed to move matter and the heat that flows from hot to cooler samples of matter. Energy: the capacity to do work ( mechanical) (joule -j) 1j=0. 239 cal. 1 calorie is the energy needed to raise temp of 1 gram of water by 1 degree c (4. 18j) Work: when an object is moved over some distance as a result of force. Kinetic energy: possessed by matter because of its mass and speed. Power: rate at which energy is consumed received or delivered. (energy/time) Potential energy: stored in a system and potentially available for use. Watt(w) 1 joule/sec or kw or kilowatt hours (kwh) =1000w x hour (3. 6mj) Consisting of oscillating electric and magnetic fields, which propagate in space as a wave. They carry energy since they can do work on other charges. Vibrating electric charge causes ripples in surrounding electromagnetic field. Can be measured by frequency and wavelength. Wavelength: distance between successive cycles in space.
