Which term describes a flash caused by an electric current ionizing a gas or vapor?

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Multiple Choice

Which term describes a flash caused by an electric current ionizing a gas or vapor?

Explanation:
A discharge where an electric current passes through ionized gas and creates a bright, visible spark is called an arc. When a strong electric field ionizes the air or vapor between conductors, a conductive plasma channel forms and current can jump across the gap, producing that characteristic flash. The other terms don’t describe this phenomenon: an armature is the rotating part of a machine like a motor or generator, an autotransformer is a type of transformer with a shared winding, and an amplifier increases signal strength without involving ionization of gas. So the term that fits is arc.

A discharge where an electric current passes through ionized gas and creates a bright, visible spark is called an arc. When a strong electric field ionizes the air or vapor between conductors, a conductive plasma channel forms and current can jump across the gap, producing that characteristic flash. The other terms don’t describe this phenomenon: an armature is the rotating part of a machine like a motor or generator, an autotransformer is a type of transformer with a shared winding, and an amplifier increases signal strength without involving ionization of gas. So the term that fits is arc.

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