ohm's law
Low (Common in technical contexts, rare in general discourse)Technical, Academic, Scientific
Definition
Meaning
A fundamental law of electrical circuits stating that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them, given by the formula I = V/R.
While originally an empirical physical law for ideal resistors, the term is used metaphorically in some contexts (e.g., business, pedagogy) to describe a simple, fundamental, and direct relationship between core variables in a system.
Linguistics
Semantic Notes
Always written with an apostrophe (Ohm's). Refers specifically to the relationship defined by Georg Ohm. While the core relationship is fixed, discussions may involve 'deviations from', 'limitations of', or 'applications of' Ohm's law.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or spelling. Pronunciation of 'Ohm' may follow general national patterns for the vowel.
Connotations
Purely technical term with identical connotations in both varieties.
Frequency
Equally frequent in technical/engineering contexts in both regions; equally absent from general speech.
Vocabulary
Collocations
Grammar
Valency Patterns
Ohm's law states that V = IR.According to Ohm's law, ...This can be derived from Ohm's law.A direct application of Ohm's law shows...The circuit obeys/violates Ohm's law.Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Almost never used. Potential metaphorical use: 'In sales, our Ohm's law is that revenue is directly proportional to customer calls.'
Academic
Core concept in physics and electrical engineering textbooks, lectures, and problem sets.
Everyday
Extremely rare. Might be mentioned when discussing basic electronics or home wiring in a simplified way.
Technical
The primary domain of use. Essential in electrical engineering, circuit design, physics labs, and electronics manuals.
Examples
By Part of Speech
verb
British English
- (Not applicable. 'Ohm's law' is a noun phrase. One might 'apply' or 'use' it.)
American English
- (Not applicable. 'Ohm's law' is a noun phrase. One might 'apply' or 'use' it.)
adverb
British English
- (Not applicable.)
American English
- (Not applicable.)
adjective
British English
- (Not directly applicable. The derived term 'ohmic' is used, as in 'ohmic resistance'.)
American English
- (Not directly applicable. The derived term 'ohmic' is used, as in 'ohmic resistance'.)
Examples
By CEFR Level
- We learned a simple rule in science: Ohm's law.
- Ohm's law helps us calculate voltage if we know current and resistance.
Learning
Memory Aids
Mnemonic
VIRtually Every Boy Is Ready (V = I x R, where V=Voltage, I=Current, R=Resistance). Or: 'Ohm my! V is I times R!'
Conceptual Metaphor
ELECTRICAL FLOW IS FLUID FLOW (Voltage is like water pressure, current is flow rate, resistance is pipe narrowness). Ohm's law is the quantitative rule governing this metaphorical system.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as 'Закон Ома' with a lowercase 'з' for 'закон'—the standard is with an uppercase 'З' when referring to the specific law: 'Закон Ома'.
- The possessive 's (Ohm's) is integral to the English term; Russian uses the genitive case (Ома) without an apostrophe equivalent.
Common Mistakes
- Misspelling as 'Ohms law' (missing apostrophe) or 'Ohm's Law' (unnecessary capital L).
- Incorrectly stating the formula as V = I/R or R = V*I.
- Applying it to all electrical components (it only applies to ohmic materials/resistors under constant conditions).
Practice
Quiz
Ohm's law is most accurately stated as:
FAQ
Frequently Asked Questions
It was formulated by the German physicist Georg Simon Ohm in 1827.
No, it applies specifically to 'ohmic' materials (like most metals at constant temperature). Materials like diodes and transistors are non-ohmic.
Voltage (V) in volts (V), Current (I) in amperes (A), Resistance (R) in ohms (Ω).
In its basic form (V=IR), it applies to the instantaneous values in resistive AC circuits. For circuits with capacitance or inductance, a more complex AC form using impedance (Z) is used: V = IZ.