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lecture 5 (energy) - overhead-2

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University of British Columbia Elec Machines & Electronics EECE 365 – Winter 2013 Lecture 5: Energy Nathan Ozog Page 1 of 6 Energy in Magnetic Circuits Consider the Inductor Begin with the classical equation for = W  Use that = F  is the equation for force on a charged particle Gives: = ⋅ = ∫  L F  d W  Consider that current, i , is equal to the rate of change of charge That is: = ⇒ =  q dt dq i  = ⋅ = ∫  L E  d idt W  Next, if we are considering the electric field around a loop (or N loops), then can be used: ∫ ∫  = ⋅  S B L E  d dt d  N d  This gives ( ) ∫ =  dt i W  

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Page 1: Lecture 5 (Energy) - Overhead-2

8/10/2019 Lecture 5 (Energy) - Overhead-2

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