GEOG 3EE3 Lecture : Electricity.docx

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Metals: release and transmit electrons easily good conductors. Charge = coulomb = 6. 25 x 1018 electrons. Current = i = ampere = coulomb per second. Volt = 1 joule / 1 coulomb = potential difference. Generating electricity: magnetic field induced by current, current induced by magnetic field, charged particles experience force when travelling in certain directions in a magnetic field. 1 watt = 1 volt x 1 amp. Pushes steam through turbines and spins rotor through a magnetic field to generate electricity. Power output = 2. 83 x 10-4d2v3 kwh. Ac current sent to grid or to a home. Need to come up with incentive policies. Keep some nuclear and increase renewable switch coal to more cogeneration. Solar energy knocks electrons loose and creates current. Cheaper types of pv cells have less efficiency. Efficiency: double up glass layers to absorb different wave lengths too expensive. Solar-grade silicon ways to bring down cost, lower temps so cheaper to produce.

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