Work, Power & Energy ResourcesEdexcel IGCSE Physics: Flashcards

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State the equation for work done.

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State the equation for work done.: W = F × d, where F is force and d is distance moved in the direction of the force.
What does work done equal?: Energy transferred.
State the equation for gravitational potential energy.: GPE = m × g × h.
State the equation for kinetic energy.: KE = ½ × m × v².
For a freely falling object (ignoring air resistance), how does loss in GPE relate to gain in KE?: Loss in GPE equals gain in KE.
Define power.: The rate of transfer of energy, or the rate of doing work.
State the equation for power.: P = W/t.
How do wind turbines generate electricity?: The kinetic energy of moving air turns turbines connected to generators.
How do solar cells generate electricity?: They convert radiation from the Sun directly into electrical energy.
How do fossil fuel power stations generate electricity?: Chemical energy is released by burning fuel, which heats water to steam that turns turbines connected to generators.
How does nuclear power generate electricity?: Nuclear energy is released by fission, heating water to steam, which turns turbines connected to generators.
What is a key disadvantage of renewable resources like wind and solar?: They can be unreliable because they depend on weather conditions.
What is a key disadvantage of fossil fuels as an energy resource?: Burning them releases greenhouse gases and pollutants.
Calculate the power of a machine that does 5000 J of work in 10 s.: P = W/t = 5000/10 = 500 W.