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Browse key terms and definitions across all GCSE subjects. Search by keyword or filter by subject and exam board.
23,110 key terms
Energy per gram
Energy content expressed for each unit of mass, commonly in joules per gram.
Energy recovery
Obtaining useful energy from waste, for example by burning it to generate electricity.
Energy recovery
Obtaining useful energy from waste, for example by burning suitable waste timber to produce heat.
Energy requirement
The amount of energy a person needs to support basic life processes and their daily activities.
Energy resource
A source that can be used to provide energy, such as coal, wind or sunlight.
Energy resource
A source of energy that people can use for heating, transport or generating electricity.
Energy resource
A source from which energy can be obtained for uses such as transport, electricity generation or heating.
Energy security
Access to an uninterrupted, affordable and accessible supply of energy.
Energy storage system
A system that retains energy so that it can be transferred and used later.
Energy store
A way in which energy is held, such as a kinetic, thermal, chemical or gravitational potential energy store.
Energy store
A way in which a system holds energy, such as a chemical, kinetic or thermal energy store.
Energy supply
The energy made available for use from resources such as coal, oil, natural gas, uranium, wind and sunlight.
Energy surplus
A situation in which available energy supply exceeds demand.
Energy surplus
A state in which energy intake is greater than energy expenditure.
Energy transfer
The movement of energy from one place or set of substances to another; energy is not created or destroyed.
Energy transfer
The movement of energy from one store to another, either within a system or across its boundary.
Energy transfer diagram
A representation using boxes and arrows to show how energy moves between stores.
Energy transfer pathway
A mechanism by which energy moves between stores, such as mechanical work, electrical work, heating or radiation.
Energy transfer pathway
A process by which energy moves between stores, such as mechanical working, electrical working, heating or radiation.
Energy transferred
Energy moved from one store to another or carried from one place to another, measured in joules (J).
Energy transferred
The amount of energy moved between energy stores or supplied by a transfer process, measured in joules (J).
Energy transition
A change in the resources used to supply energy, such as a shift from fossil fuels towards low-carbon resources.
Energy use per capita
The amount of energy consumed in a country over a period, usually a year, divided by its population.
Energy use per person
Total energy use divided by the number of people; an average, not the amount used by every individual.
E-newsletter
An email containing business news, product information or offers sent to people on a business’s mailing list.
Enforcement
Putting laws into practice through monitoring, preventing illegal activity and applying penalties.
Engaged Buddhism
An approach that applies Buddhist teachings to social problems through practical, peaceful action.
Engagement pattern
A pattern of participation in physical activity or sport, including differences in participation rates between social groups.
Engineering control
A control that physically separates people from a hazard, such as a fume cupboard or safety screen.
English Civil War
The wars between Charles I and Parliament over royal authority, religion and control of government, which culminated in the king’s defeat and execution in 1649.
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