A measure of the degree to which a substance impedes the flow of electric current induced by a voltage. Resistance is measured in ohms. Good conductors, such as copper, have low resistance. . Mar 13, · Resistance is the opposition that a substance offers to the flow of electric current. It is represented by the uppercase letter R. The standard unit of resistance is the ohm, sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega.
Resistancein electricityproperty of an electric circuit or part of a xcience that transforms electric energy into heat rezistance in opposing electric current. Resistance involves collisions of the current-carrying charged particles with fixed particles that make up the structure of the conductors.
Resistance how to make origami with construction paper often considered as localized in such devices as lampsheatersand resistorsin which it predominates, although it is characteristic of every part of a circuit, including connecting wires and electric transmission lines. The dissipation of electric energy in the form of heat, even though small, affects the amount of electromotive forceor driving voltage, required to produce a given current through resisance circuit.
In fact, the electromotive force V measured in volts across a circuit divided by the current I amperes through that circuit defines quantitatively the amount of electrical resistance R. Thus, if a volt battery steadily drives a two-ampere current through a length of wire, the wire has a what does resistance mean in science of six volts per ampere, or six ohms. The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area.
Resistance also depends on the material of the conductor. See resistivity. The resistance of a conductor, or circuit element, generally increases with increasing temperature. When cooled to extremely low temperatures, some conductors have zero resistance. Currents continue to flow in these substances, called superconductorsafter removal of the applied electromotive force.
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Resistande how resistance affects the flow of electrons in an electric circuit. In every electric circuit there is some resistance to what are the 2 major branches of science flow of electric current, even in materials that are good conductors.
Get a Britannica Premium subscription and gain access to exclusive content. Subscribe Now. Learn More in these related Britannica articles:. This familiar phenomenon occurs in the heating coils of an electric range or in the hot tungsten filament of an electric light bulb. This ohmic heating is the basis for the fuses used to protect electric circuits and prevent fires; if the current exceeds a certain value,….
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Oct 31, · Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (), a German physicist who studied the relationship between voltage, current and resistance. He is credited for formulating Ohm's Law. resistance. [ re-zis´tans] 1. opposition, or counteracting force, as opposition of a conductor to passage of electricity or other energy or substance. 2. the natural ability of a normal organism to remain unaffected by noxious agents in its environment; see also immunity. 3. in psychology or psychiatry, conscious or unconscious defenses against change, preventing repressed material from . Resistance is a measure of how much a component decreases the current (see resistor). The bigger the resistance, the smaller the current. Resistance is measured in ohms (symbol Ω).
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See more words from the same century. Accessed 29 Apr. More Definitions for resistance. See the full definition for resistance in the English Language Learners Dictionary. Nglish: Translation of resistance for Spanish Speakers. Britannica English: Translation of resistance for Arabic Speakers. What made you want to look up resistance? Please tell us where you read or heard it including the quote, if possible.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! It's dirty work, but we took the plunge. A Shakespearean comedy of errors. You've waited days, weeks, months, even years for We're intent on clearing it up. We're gonna stop you right there.
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Test your vocabulary with our question quiz! Login or Register. Save Word. Definition of resistance Entry 1 of 2. Definition of resistance Entry 2 of 2. Keep scrolling for more. Examples of resistance in a Sentence Noun They have shown a stubborn resistance to change. The troops met heavy resistance as they approached the city. The paint shows good weather resistance.
Over time the patient could develop a resistance to the drug. Recent Examples on the Web: Noun Her sense of resistance was as manufactured as her need to buy flattering clothing. First Known Use of resistance Noun 14th century, in the meaning defined at sense 1a Adjective , in the meaning defined above.
Learn More about resistance. Time Traveler for resistance The first known use of resistance was in the 14th century See more words from the same century. Dictionary Entries near resistance resiny resipiscence resist resistance resistance box resistance coil resistance derivatives See More Nearby Entries. Style: MLA. English Language Learners Definition of resistance.
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We're intent on clearing it up 'Nip it in the butt' or 'Nip it in the bud'? We're gonna stop you right there Literally How to use a word that literally drives some pe Is Singular 'They' a Better Choice?
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