1.7 Energy, work and power1. Motion, forces and energy
-- Core -- ✔︎ State that energy may be stored as kinetic, gravitational potential, chemical, elastic (strain), nuclear, electrostatic and internal (thermal). Describe how energy is transferred between stores during events and processes, including examples of transfer by forces (mechanical work done), electrical currents (electrical work done), heating, and by electromagnetic, sound and other waves. Know the principle of the conservation of energy and apply this principle to simple examples including the interpretation of simple flow diagrams. Understand that mechanical or electrical work done is equal to the energy transferred. Recall and use the equation for mechanical working: W = Fd = ΔE. Describe how useful energy may be obtained, or electrical power generated, from: a) chemical energy stored in fossil fuels b) chemical energy stored in biofuels c) water, including the energy stored in waves, in tides and in water behind hydroelectric dams d) geothermal resources e) nuclear fuel f) 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 be the source of wind energy h) including references to a boiler, turbine and generator where they are used. Describe advantages and disadvantages of each method in terms of renewability, availability, reliability, scale and environmental impact. Understand, qualitatively, the concept of efficiency of energy transfer. Define power as work done per unit time and also as energy transferred per unit time; recall and use the equations: a) P = W/t b) P = ΔE/t Physics Resources is independent and is not affiliated with or endorsed by Cambridge University Press & Assessment or Pearson Edexcel. Our questions are written for this site to match each course's content. They are not official exam board or past-paper questions.
