what type of particle carries an electric current through a wire?

The particle that carries electric current through a metal wire is the electron.

Quick answer

• In an ordinary metal wire (like copper), electric current is due to the motion of tiny negatively charged particles called electrons.

• These electrons are “free” to move through the metal and drift along the wire when a voltage (potential difference) is applied.

What’s actually moving in the wire?

• Metals contain a lattice of positive ions with a “sea” of free electrons that are not bound to any one atom.

• When a battery or power source is connected, an electric field pushes these free electrons so they slowly drift, and this organized motion of charge is what is called electric current.

Why electrons and not protons?

• Protons are locked inside atomic nuclei in a solid metal, so they cannot move through the wire under normal conditions.

• Electrons are much lighter and loosely bound in metals, so they are the ones that move and act as the charge carriers in the wire.

A tiny nuance

• In other materials, different charge carriers can carry current: ions in saltwater, and electrons or “holes” in semiconductors.

• But when someone asks “what type of particle carries an electric current through a wire?” in a basic physics context, the expected answer is: electrons.

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