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Published byEric Hodge Modified over 4 years ago

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Power & Efficiency Energy Resources Power Efficiency

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Energy Resources Fuel –Chemical (burning fuel) –Thermal (boiling water) –Mechanical or Kinetic (turn turbines) –Electrical

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Energy Resources Solar –Light (sun shining on solar panels) –Electrical

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Energy Resources Nuclear –Nuclear (splitting of atoms) Or combining of atoms –Thermal (boiling water) –Kinetic (turn turbines) –Electric

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Energy Resources Wind –Kinetic (Moving air) –Mechanical or Kinetic (turn turbines) –Electrical

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Energy Resources Wave –Kinetic (Moving water) –Mechanical or Kinetic (turn turbines) –Electrical

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Energy Resources Hydroelectric –Potential (water at a height) –Kinetic (Moving water) –Mechanical or Kinetic (turn turbines) –Electrical

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Energy Resources Geothermal –Thermal (Heat under the earth) –Thermal (boil water) –Mechanical or Kinetic (turn turbines) –Electrical

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Questions Which energy resource does not boil water? Which energy resource does not turn turbines? Which energy resource does not rely on the sun?

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Questions Which energy resources are renewable? Which energy resources are non- renewable? Which energy resource is the best? Why?

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Power Work done per unit time Energy per unit time P = work/time = energy / time Units –Joules per second, Js -1 –Watt, W

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Example A motor-driven lift carries 24 bricks to the top of a 3 m wall. If each brick weighs 10 N and takes 15 s to get to the top, how much is the power output of the motor? If the motor has a power rating of 1000 W, how long will it take to lift 100 bricks?

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Efficiency Describes how much of the energy supplied is used than wasted. Efficiency = useful output power ÷ input power –Output energy ÷ input energy –No units –May be expressed in percentage

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Example A block is dragged up a slope with a force of 80 N. The block weighs 100 N and the slope is 20 m long and 10 m high. Calculate the efficiency of the work done.

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