ELEC1310 Lecture Notes - Lecture 10: Inductor, Short Circuit, Inductance

• School: University of Newcastle
• Department: Electrical Engineering
• Course: ELEC1310
• Professor: Colin Coates

Document Summary

Essentially a coil of wire around a (cid:498)core(cid:499) (cid:523)with high magnetic permeability(cid:524) With a current, a coil generates a magnetic flux. Varying flux voltage induced = rate of change of flux over time. )nductors used to (cid:498)smooth(cid:499) current variations: e. g. to remove electrical noise. Fast changes of current induce large voltages. Inductors also used to generate large voltages: e. g. spark plugs in cars. All variables are constant steady state. The voltage across the inductor is zero: vl = 0. The same current flows through all inductors. Power: at any time t, the power absorbed by an inductor is : Energy: the total energy absorbed by an inductor from time 0 to t is. As for the capacitor: the energy does not depend on the path, only the initial and final current. If i(t) = i(0) , net energy absorbed is zero: energy stored in an inductor is referred to as i(0) = 0.