rheostat: meaning, definition, pronunciation and examples
LowTechnical/Formal
Quick answer
What does “rheostat” mean?
A variable resistor used to control the flow of electric current by adjusting resistance.
Audio
Pronunciation
Definition
Meaning and Definition
A variable resistor used to control the flow of electric current by adjusting resistance.
A device for varying the resistance in an electrical circuit without interrupting the current, typically used to control the intensity of lights, speed of motors, or temperature of heating elements.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences; term is identical in both varieties.
Connotations
Identical technical connotations in both varieties.
Frequency
Equally low frequency in both UK and US English, confined to electrical engineering, physics, and specific industrial contexts.
Grammar
How to Use “rheostat” in a Sentence
[Subject] adjusted the rheostat to [effect]The [device] is controlled by a rheostat[Number]-ohm rheostatVocabulary
Collocations
Examples
Examples of “rheostat” in a Sentence
verb
British English
- We need to rheostat the circuit for finer control. (Very rare/technical)
- The engineer rheostatted the motor to prevent overload. (Rare/technical)
American English
- He rheostatted the lights to create a mood. (Very rare/technical)
- You can rheostat the heater to save power. (Rare/technical)
adverb
British English
- The current was increased rheostatically. (Highly technical)
- Power was applied rheostatically to avoid a surge. (Highly technical)
American English
- The motor speed was controlled rheostatically. (Highly technical)
- The voltage was lowered rheostatically. (Highly technical)
adjective
British English
- The rheostatic control was smoother than expected.
- This is a rheostatic braking system.
American English
- We installed a rheostatic dimmer in the studio.
- The rheostatic function allows precise adjustment.
Usage
Meaning in Context
Business
Rare; might appear in procurement for electrical components or industrial equipment specifications.
Academic
Used in physics and electrical engineering textbooks, lab manuals, and lectures on circuit theory.
Everyday
Virtually never used in everyday conversation; laypeople would say 'dimmer switch' or 'speed control'.
Technical
Standard term in electrical engineering, vintage electronics repair, theatre lighting (for older systems), and some industrial control panels.
Vocabulary
Synonyms of “rheostat”
Strong
Neutral
Vocabulary
Antonyms of “rheostat”
Watch out
Common Mistakes When Using “rheostat”
- Misspelling as 'reostat', 'rheostate'.
- Confusing with a 'potentiometer' (which divides voltage) vs. a rheostat (which varies resistance in series).
- Using in non-technical contexts where simpler terms exist.
FAQ
Frequently Asked Questions
In principle, yes for lighting control, but 'dimmer switch' is the common household term. Modern dimmers are usually electronic, while traditional rheostats are variable resistors.
Most commonly in educational physics/electronics labs, antique or vintage electrical equipment, some industrial motor controls, and model train controllers.
A rheostat is a two-terminal device used to vary resistance in a circuit (series connection). A potentiometer is a three-terminal device typically used as a variable voltage divider. Many potentiometers can be wired as rheostats.
Because solid-state electronics (like TRIACs and transistors) have largely replaced bulky, heat-wasting resistive components for control purposes in most consumer and industrial applications.
A variable resistor used to control the flow of electric current by adjusting resistance.
Rheostat is usually technical/formal in register.
Rheostat: in British English it is pronounced /ˈriː.ə.stæt/, and in American English it is pronounced /ˈriː.ə.stæt/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms for this technical term]”
Learning
Memory Aids
Mnemonic
Think: 'RHEO' (like 'river' flow of electricity) + 'STAT' (like 'static' or 'stationary' control) = a device that controls the flow.
Conceptual Metaphor
A TAP FOR ELECTRICITY (controlling current like water flow).
Practice
Quiz
What is the primary function of a rheostat?