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1.2.1 Energy transfers in a system - Energy can be transferred usefully, stored or dissipated. - Law of conservation of energy: energy cannot be created or destroyed.
Revision for AQA Physics GCSE, including summary notes, exam questions by topic and videos for each module.
A renewable energy resource is one that is being (or can be) replenished as it is used. The uses of energy resources include: transport, electricity generation and heating. Students should be able to: Describe the main energy sources available. Descriptions of how energy resources are used to generate electricity are not required.
The gravitational potential energy stored within an object is transferred into kinetic energy as it falls, causing it to speed up. Ignoring friction, the gravitational potential energy at the top of the fall is equal to kinetic energy at the bottom of the fall.
Topic 1: Energy. Notes. (Content in bold is for Higher Tier only) Stores. A system is an object or group of objects. When a system changes, the way energy is stored also changes. Examples: Ball rolling and hitting a wall. System is moving ball. When it hits the wall, (some of) the kinetic energy is transferred as sound. Vehicle slowing down.
Heating a material transfers the energy to its thermal energy store - the temperature increases. E.g. a kettle: energy is transferred to the thermal energy store of the
Part I – Energy and its Uses. 2. Units and scales of energy use (PDF - 1.1MB) 3. Mechanical energy and transport (PDF) 4. Heat energy: Conversion between heat and mechanical energy (PDF ‑ 2.9MB) 5. Electromagnetic energy: Storage, conversion, transmission and radiation (PDF - 7.7MB)
