Definition

A device that changes the amount of electrical resistance in a circuit to control the flow of electricity.

Example

The technician adjusted the rheostat to increase the brightness of the light.

Conversation

I just bought a new rheostat for my electronics project.

Oh nice! What are you planning to use it for?

I want to regulate the current more effectively in my circuit.

That sounds like a smart idea; it should help a lot!

Synonyms & Antonyms

Root Explanation

Rheostat → It is formed from "rheo-" (from Greek "rheos", meaning flow) and "-stat" (from Greek "statos", meaning standing or stationary). The word describes a device that controls the flow of electric current by varying resistance, thus regulating the flow of electricity.

Memory Tip

Think of 'flow' ('rheo-') being controlled by something that 'stands' ('-stat') still — that's how a rheostat manages the flow of electricity.

Visually Confused Words