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Earth Wire - GCSE Physics Definition

Reviewed by: Philippa Platt

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An earth wire, also known as a grounding wire, is an essential safety component in electrical circuits, designed to protect users from electric shocks. It provides a path for electrical current to safely travel to the ground in case of a fault, such as when the live wire accidentally comes into contact with a metal casing.

A diagram showing the three wires going to a mains powered appliance: Live, Neutral and Earth

Typically positioned alongside the live and neutral wires in a cable, the earth wire is usually coated with green and yellow stripes. It helps prevent electrical hazards by ensuring that any excess current is directed away from appliances and safely dissipated into the earth.

Understanding the role and function of an earth wire is crucial for GCSE Physics students studying electrical safety and circuit design.

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Philippa Platt

Reviewer: Philippa Platt

Expertise: Chemistry Content Creator

Philippa has worked as a GCSE and A level chemistry teacher and tutor for over thirteen years. She studied chemistry and sport science at Loughborough University graduating in 2007 having also completed her PGCE in science. Throughout her time as a teacher she was incharge of a boarding house for five years and coached many teams in a variety of sports. When not producing resources with the chemistry team, Philippa enjoys being active outside with her young family and is a very keen gardener

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