Definition · Plain-language
Electricity
Electricity is the set of physical effects produced by electric charge, including static charge and the flow of charge that powers our devices.
The step most authors miss
Doing CRediT right? Don’t stop at the statement.
A CRediT statement credits you inside one paper. The recognition CRediT was built for happens when those roles are tied to you, persistently. Sign in with your ORCID — free — and claim your CRediT contributions on casrai.org, the home of the standard. They become a verified, portable part of your identity, not a line that disappears into one PDF.
Free: claim your contributions, then export a journal-ready CRediT statement, schema.org structured data, JATS XML, CSV or BibTeX — and preview your public profile. A membership publishes that profile publicly and verifies the journals you serve.
Charge, current and voltage
Electricity begins with electric charge, a basic property of matter that comes in positive and negative forms. When charge flows — most often as electrons moving through a metal wire — that flow is an electric current, measured in amperes. To make charge flow you need a push, called voltage or potential difference, measured in volts; it is the energy given to each unit of charge. Resistance, measured in ohms, opposes the flow. These three quantities are linked, so for a given voltage a higher resistance means a smaller current.
Circuits and conductors
A current only flows around a complete, unbroken loop called a circuit. The charge needs a continuous conducting path from the source, through the components, and back again; breaking the loop with a switch stops the flow. Materials that let charge move freely are conductors, typically metals such as copper, while materials that block it are insulators, such as rubber and plastic. This is why wires are made of copper wrapped in plastic — the metal carries the current and the insulation keeps it safely contained.
Carrying and converting energy
Electricity is so useful because it carries energy from where it is generated to where it is needed, then converts cleanly into other forms. In a lamp the current produces light and heat; in a motor it produces motion; in a speaker it produces sound. The rate at which it delivers energy is the power, measured in watts, equal to voltage multiplied by current. Generating stations produce electrical energy from other sources — burning fuel, falling water, wind or sunlight — and the grid distributes it.
Key facts
At a glance
- Definition: phenomena arising from electric charge, at rest or in motion
- Current: the flow of electric charge, measured in amperes (A)
- Voltage: the push that drives current, measured in volts (V)
- Resistance: opposition to current, measured in ohms (Ω)
- Power: energy delivered per second, measured in watts (W)
- Circuit: current needs a complete, unbroken conducting loop
Common misconceptions
What people often get wrong
Often heard: Electricity is the same thing as electrons.
Actually: Electrons are charged particles whose flow often carries current, but electricity is the broader set of effects of charge — including static charge and electric and magnetic fields — not the particles themselves.
Often heard: Electrons travel through a wire at nearly the speed of light.
Actually: The electrical effect spreads near light speed, but the electrons themselves drift very slowly, often less than a millimetre per second. It is the energy and signal that move fast, not the individual charges.
Often heard: Current flows even without a complete circuit.
Actually: A sustained current needs an unbroken loop. Break the circuit, for instance with an open switch, and the steady flow of charge stops.
Going deeper
