FREE LEARNING SERIES
Physics: heat, waves, light and electricity
Follow energy transfers through matter, sound, light and ideal circuits.
4 lessons · Learn at your own pace
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Learn, practise, explain
Try the exercise before reading its explanation. Answer the self-check questions in your own words, then compare your reasoning with the answers. Revisit any difficult section before moving on. No account or payment is needed.
- 01
Heat, temperature and energy transfer
A steel tumbler and a cloth bag in the same room can feel different even when their temperatures are equal. Understanding that puzzle connects particle motion, thermometers, insulation and the energy needed to change temperature.
Learning outcome: Explain conduction, convection and radiation, calculate simple heating and mixing cases, and state which energy transfers a model ignores.
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Waves, sound and hearing
When a school announcement reaches the back of a room, air from the loudspeaker has not travelled all the way into every listener’s ear. A disturbance travels through air, carrying energy and information. Follow that disturbance from its source to the brain.
Learning outcome: Distinguish particle motion from wave motion, calculate wavelength and echo distance, and explain the main stages of hearing using a labelled paper model.
Open lesson → - 03
Light, reflection and refraction
A printed page, a mirror image and a pencil seen through water all become visible because light reaches the eye. A ray diagram helps us trace the actual light path and distinguish it from the place an object only appears to occupy.
Learning outcome: Construct plane-mirror ray diagrams, distinguish real and virtual images, predict basic refraction directions and calculate refractive index from speed.
Open lesson → - 04
Electricity: current, voltage and resistance
A torch needs a complete conducting path, a source of energy and components that transfer that energy. Three quantities help describe the circuit: current counts charge flow, voltage measures energy per charge, and resistance relates the two.
Learning outcome: Explain circuit quantities, analyse ideal series and parallel resistor networks, and check charge and energy accounts entirely with paper diagrams.
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