negative resistance
Low (Specialized Technical Term)Technical/Scientific
Definition
Meaning
An electrical phenomenon where an increase in voltage across a device leads to a decrease in current through it, contrary to Ohm's Law.
In a broader systems context, it can metaphorically describe a situation where an applied force or stimulus produces an opposing or diminishing response, often leading to instability or unexpected behavior.
Linguistics
Semantic Notes
This is a counter-intuitive physical property. It does not mean 'the absence of resistance' but rather a specific type of active resistance with a negative differential value (dV/dI < 0). It is a property of certain non-linear devices.
Dialectal Variation
British vs American Usage
Differences
No significant differences in technical meaning. Spelling conventions follow regional norms (e.g., 'behaviour' vs. 'behavior' in surrounding text).
Connotations
Purely technical term in both varieties.
Frequency
Equally low-frequency and confined to electronics, physics, and engineering contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
[Device/Component] exhibits negative resistance over a certain voltage range.The [tunnel diode] operates in a negative resistance region.Negative resistance is utilized in [oscillator circuits].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None. This is a technical term not used idiomatically.”
Usage
Context Usage
Business
Virtually never used.
Academic
Used in physics, electronic engineering, and materials science papers and textbooks.
Everyday
Not used.
Technical
Core term in electronics for describing devices like tunnel diodes, Gunn diodes, neon lamps, and some gas discharge tubes. Essential for understanding oscillator and amplifier design.
Examples
By Part of Speech
verb
British English
- The characteristic curve of the device begins to negative resist above 2 volts.
- It is designed to negative-resist under those conditions.
American English
- The component negatively resists in that operating region.
- Circuits can be built to exploit negative resisting elements.
adverb
British English
- The current changed negatively resistive beyond the peak point.
- The device behaves negatively resistively.
American English
- The voltage-current relationship developed negatively resistively.
- It functions almost negatively resistantly in that mode.
adjective
British English
- The negative-resistance region is clearly visible on the graph.
- We need a negative-resistance device for the oscillator.
American English
- The negative resistance characteristic is unstable.
- This is a classic negative-resistance circuit topology.
Examples
By CEFR Level
- The scientist talked about a special diode with negative resistance.
- Negative resistance is not common in simple circuits.
- The tunnel diode exploits negative resistance to create oscillations without an external feedback circuit.
- Engineers must carefully bias a device to operate in its negative resistance region.
- The manifestation of negative resistance in the I-V curve is indicative of energy being supplied by the device itself, leading to potential instability that must be carefully controlled within the circuit's design.
- Negative resistance phenomena, such as those found in Gunn diodes, form the bedrock of modern microwave oscillator design for radar and communication systems.
Learning
Memory Aids
Mnemonic
Think of pushing a door that pulls you in instead—more push (voltage) results in less movement (current). Negative Resistance = 'More effort, less flow.'
Conceptual Metaphor
A REBELLIOUS RESPONSE: A system that does the opposite of what is expected when pushed.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- False friend: 'Негативное сопротивление' is a direct calque and is correct technically, but the concept is highly specialized. Avoid confusing it with the common meaning of 'negative' as 'bad'. It means 'negative' in the mathematical sense.
Common Mistakes
- Using it to mean 'no resistance' or 'low resistance'.
- Applying it to ordinary resistors (which have positive resistance).
- Confusing it with 'insulation' or 'high resistance'.
Practice
Quiz
What is the primary consequence of negative resistance in a simple circuit?
FAQ
Frequently Asked Questions
No, absolutely not. 'Negative resistance' is an active property where the device adds energy to the circuit. 'No resistance' (superconductivity) or 'high resistance' (insulation) are passive properties.
No. Ordinary, passive resistors always have positive resistance. Negative resistance is a property of specific active, non-linear electronic components.
Its primary applications are in electronic oscillators (to generate repeating signals), high-frequency amplifiers, and switching circuits. It's foundational for devices in microwave and radio frequency engineering.
No. The device itself (e.g., a diode with a specific doping profile) provides the energy that causes the negative resistance effect. It is not a passive material creating energy from nothing.