A typical question is about energy transfer - Explain the process of convection and give an example of where we can find them
Molecules in the air encounter an energy source, they gain energy and begin to heat up which causes them to vibrate faster and become less dense which causes them to rise. As they rise, they begin to lose energy, move slower and become more dense which causes them to drop again. This process is repeated.Convection currents are found in the mantle below the Earth's crust and in some kitchen appliances.
MM
Related Physics GCSE answers
All answers ▸What actually is current? Why does it differ from potential difference?
Why is the sky blue?
The Alternating Current Flowing through the Primary Coil of the Transformer Creates an Alternating Current in the Secondary coil. Explain how!
A coil is connected to a voltmeter. A bar magnet, initially held above the coil, is left to fall into the coil. Explain why the voltmeter shows a reading. How will the reading of the voltmeter be affected if the magnet is dropped from a greater height?