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Electrical Power Generation

Electrical Power Generation. How Does an Electric Generator Work?. Rotating turbine attached to an electrical generator, a wire coil. F ree electrons moving in a magnetic field leading to an AC current. PhET Generator - Electricity. How Are AC Currents Generated?.

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Electrical Power Generation

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  1. Electrical Power Generation

  2. How Does an Electric Generator Work? • Rotating turbine attached to an electrical generator, a wire coil. • Free electrons moving in a magnetic field leading to an AC current. PhET Generator - Electricity

  3. How Are AC Currents Generated? • Electricity is generated via transforming other forms of energy.

  4. DC and AC Currents R - + a b ~ DC AC V(t) = V0 V(t) = V0sin(2 f t) I(t) = I0 I(t) = I0sin(2 f t) Peak voltage: V0 Peak current: I0

  5. Hydro Power Gravitational potential energy is transformed into electrical energy. Power = Energy/Time P = Dm g h/Dt the power depends on the amount of the water per unit time. P = r g h (DV/Dt) The term in brackets is the flow rate, which is a volume per unit time, measured in m3/s.

  6. Wind Turbines

  7. Wind Power • Wind energy is in form of kinetic energy: K = ½ m v2 • in terms of a flow rate and consider power: Using the density (r = 1.28 kg/m3 for air). P = ½ r (DV/Dt) v2 • Important for the windmill is the amount of wind that moves through the area A defined by the rotor blades: DV/Dt = A Dx/Dt = A v. • P = ½ r A v3

  8. Wind Power: Le Nordais Wind Turbine This is data from a online text. We can proof that it’s wrong! P = ½ r A v3 (available power) = 28.5 kW (at 15 km/h) = 1.12 MW (at 51 km/h)

  9. Thanks for coming to my lectures.

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