Contents
Independent final check
Explain without the key
state / describe
Final check
(a) State the energy store of each of these: a hammer raised above a nail; the plutonium in the power pack of a space probe; hot water in a bath. (b) State four ways in which energy can be transferred from one store to another. (c) State the principle of the conservation of energy. (d) An electric fan, plugged into the mains, is switched on. Describe the energy transfers from the mains to the moving blades and the surroundings.
state: give a concise answer. describe: give the features or what happens.
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
Energy stores: kinetic, gravitational potential, chemical, elastic (strain), nuclear, electrostatic and internal (thermal) (1.7.1.1); transfers between stores by forces (mechanical work done), electrical currents (electrical work done), heating, and electromagnetic, sound and other waves (1.7.1.2); the principle of the conservation of energy, applied to simple examples including the interpretation of simple flow diagrams (1.7.1.3); Supplement: kinetic energy, Ek = ½mv² (1.7.1.4), change in gravitational potential energy, ΔEp = mgΔh (1.7.1.5), and the conservation of energy applied to complex examples, with Sankey diagrams (1.7.1.6); mechanical or electrical work done as energy transferred (1.7.2.1), W = Fd = ΔE (1.7.2.2); power as work done per unit time and energy transferred per unit time, P = W/t = ΔE/t (1.7.4.1). Energy resources and efficiency (1.7.3) are left to the next module, and electrical power (4.2.5) to the electricity modules.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus