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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
Electrification
The spread of electricity supplies to homes, factories and other buildings.
Electrocardiogram (ECG)
A test that records the heart’s electrical activity and can help identify an irregular heartbeat.
Electrochromic material
A material that changes colour when an electrical stimulus is applied.
Electrode
A conducting material through which charge enters or leaves an electrolyte; in a simple cell, the electrodes are two different metals.
Electrode
An electrical conductor through which current enters or leaves an electrolyte.
Electroluminescence
The production of light by a material in response to electrical stimulation.
Electrolysis
The breakdown of an ionic substance by passing an electric current through it when molten or dissolved in water.
Electrolysis
The breakdown of a compound using an electric current.
Electrolyte
A conducting liquid containing mobile ions, which allows charge to move between the electrodes inside a cell.
Electrolyte
A liquid containing mobile ions that conducts electricity and is decomposed during electrolysis.
Electrolyte
A liquid containing mobile ions that allows electric current to flow during processes such as electroplating and anodising.
Electrolytic purification
The use of electrolysis to remove impurities from a metal.
Electromagnet
A solenoid containing an iron core, which produces a stronger magnetic field when current flows.
Electromagnet
A solenoid with an iron core that produces a stronger magnetic field when current flows.
Electromagnet
A magnet produced by an electric current, usually flowing through a coil of wire.
Electromagnetic induction
The production of a potential difference across a conductor because the magnetic field around it changes.
Electromagnetic induction
The production of a potential difference across a conductor when it cuts magnetic field lines or when the magnetic field passing through a coil changes.
Electromagnetic radiation
A transverse wave that transfers energy and can travel through a vacuum; radio waves, microwaves and infrared are types of electromagnetic radiation.
Electromagnetic radiation
Energy carried by electromagnetic waves, such as visible light.
Electromagnetic spectrum
The continuous range of electromagnetic waves, grouped according to wavelength and frequency.
Electromagnetic spectrum
The continuous range of electromagnetic waves, arranged by wavelength or frequency.
Electromagnetic wave
A transverse wave that transfers energy from a source to an absorber and can travel through a vacuum.
Electromagnetic wave
A wave that transfers energy through oscillating electric and magnetic fields and can travel through a vacuum.
Electron
A negatively charged particle occupying energy levels around an atom's nucleus.
Electron
A negatively charged particle found around an atom’s nucleus.
Electron
A subatomic particle with a relative electrical charge of −1, occupying shells around the nucleus.
Electron arrangement
The distribution of an atom's electrons between its electron shells.
Electron arrangement
The distribution of an atom's electrons among its shells, or energy levels.
Electron configuration
The arrangement of an atom’s or ion’s electrons in energy levels, often written as numbers such as 2,8,1.
Electron configuration
The arrangement of an atom’s electrons in shells, often written as numbers such as 2,8,1.
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