NATS 1945 Lecture Notes - Lecture 2: Surface Mining, Electrical Energy
28 Sep 2016
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1. 1 energy: the ability to do work - eg, to make something move or to transfer heat. Kinetic energy (from motion; increases with a mass & speed2) Typical units: calories (c) or joules (j); 1c = 4184 j (roughly 4200) Energy is always conserved: in any process, input energy equals output energy. Since energy is conserved, a falling object converts its gravitational energy as it falls. As the kinetic energy increases, the object speeds up. 1 joule is the energy required to lift a weight of 1 newton (~100 grams) a distance of 1 meter. 1 calories is defines as the amount of energy needed to raise 1 gram of water to 1 degree celsius. 1kg of water would take 1000 calories for each degree. Our 700c increase would take 1000 x 70 = 70,000. 1. 2 power: the amount fo energy produced or used in an amount of time (i. e power = energy/time)
