The resistance of dry cells varies from less than 0. The unit of electrical resistance , named after the nineteenth-century German physicist Georg Ohm. New Word List Word List. Save This Word! The resistance in ohms is numerically equal to the magnitude of the potential difference. We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Origin of ohm First recorded in ; named after G. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ohm. Send us feedback. See more words from the same year.
Ohio horsemint. Accessed 11 Nov. See the full definition for ohm in the English Language Learners Dictionary. Nglish: Translation of ohm for Spanish Speakers. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Log in Sign Up. Save Word. Definition of ohm Entry 1 of 2. Ohm biographical name. Definition of Ohm Entry 2 of 2. Thank you. A "volt" is a unit of electric potential, also known as electromotive force, and represents "the potential difference between two points of a conducting wire carrying a constant current of 1 ampere, when the power dissipated between these points is equal to 1 watt.
The characteristics of voltage are like that of water flowing through pipes. This is known as the "water-flow analogy", which is sometimes used to explain electric circuits by comparing them with a closed system of water-filled pipes, or "water circuit", that is pressurized by a pump.
Refer to the image below to visualize how voltage and electric current works Current I is a rate of flow and is measured in amps A. Ohms R is a measure of resistance and is analogous to the water pipe size.
Current is proportional to the diameter of the pipe or the amount of water flowing at that pressure. Voltage is an expression of the available energy per unit charge which drives the electric current around a closed circuit in a direct current DC electrical circuit. Increasing the resistance, comparable to decreasing the pipe size in the water circuit, will proportionately decrease the current, or water flow in the water circuit, which is driven through the circuit by the voltage, which is comparable to the hydraulic pressure in a water circuit.
The relationship between voltage and current is defined in ohmic devices like resistors by Ohm's Law. Ohm's Law is analogous to the Hagen—Poiseuille equation, as both are linear models relating flux and potential in their respective systems. Electric current I is a rate of flow and is measured in amps A.
Ohms R is a measure of resistance and is comparable to the water pipe size.
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