Cambridge IGCSE Physics1.7 Energy, work and power Worksheet

23 questions · 50 marks · Word

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What objectives does this worksheet meet?

Core

  • I can state that energy can be stored as kinetic, gravitational potential, chemical, elastic (strain), nuclear, electrostatic and internal (thermal) energy.
  • I can describe how energy is transferred between stores during events and processes, including transfers by forces (mechanical work done), by electrical currents (electrical work done), by heating, and by electromagnetic, sound and other waves.
  • I know the principle of the conservation of energy and can apply it to simple examples, including interpreting simple flow diagrams.
  • I can recall and use the equation for mechanical working, W = Fd = ΔE.
  • I can describe how useful energy can be obtained, or electrical power generated, from:a)chemical energy stored in fossil fuelsb)chemical energy stored in biofuelsc)water, including the energy stored in waves, in tides and in water held behind hydroelectric damsd)geothermal resourcese)nuclear fuelf)light from the Sun, to generate electrical power (solar cells)g)infrared and other electromagnetic waves from the Sun, to heat water (solar panels) and as the source of wind energyh)including where a boiler, turbine and generator are used.
  • I can describe the advantages and disadvantages of each method in terms of renewability, availability, reliability, scale and environmental impact.
  • I can define power as the work done per unit time, and also as the energy transferred per unit time, and I can recall and use the equations:a)P = W/tb)P = ΔE/t

Extended

  • I can recall and use the equation for kinetic energy, Ek = ½mv².
  • I can recall and use the equation for the change in gravitational potential energy, ΔEp = mgΔh.
  • I know the principle of the conservation of energy and can apply it to complex examples with several stages, including interpreting Sankey diagrams.
  • I know that nuclear fusion in the Sun releases energy.
  • I can define efficiency as:a)% efficiency = (useful energy output / total energy input) × 100%b)% efficiency = (useful power output / total power input) × 100%and I can recall and use these equations.