Showing results for back emf. Search instead for back+of.

back emf

British

noun

electrical engineering an electromagnetic force appearing in an inductive circuit in such a direction as to oppose any change of current in the circuit

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Lenz’s law tells us the emf opposes any change, so that the input emf that powers the motor will be opposed by the motor’s self-generated emf, called the back emf of the motor.

From Textbooks • Aug. 12, 2015

As the motor turns faster and faster, the back emf grows, always opposing the driving emf, and reduces the voltage across the coil and the amount of current it draws.

From Textbooks • Aug. 12, 2015

What is the back emf of a 120 V motor that draws 8.00 A at its normal speed and 20.0 A when first starting?

From Textbooks • Aug. 12, 2015

The back emf is represented as a variable emf that opposes the one driving the motor.

From Textbooks • Aug. 12, 2015

On the other hand, if there is no mechanical load on the motor, it will increase its angular velocity ω until the back emf is nearly equal to the driving emf.

From Textbooks • Aug. 12, 2015

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023