The switch in the following circuit has been closed for a long time befo opening at t = 0. Find a) i (t), t 20. b) VL(t), t 2 0*. c) i (t), t > 0*. t = 0 20 is 40 Ω 120 V { 60 N UL 250 mH - 100 N{ 60 Ω

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Sinusoids And Phasors

Sinusoids are defined as the mathematical waveforms that are used to describe the nature of periodic oscillations.

Circuit Theory

Electric circuits are a network that comprises of a closed-loop, which helps in providing a return path for the current through a switch. When the switch is activated, the load operates, and the current accepts a path to finish the circuit at a low potential level from the opposing high potential level. Electric circuits theory is a linear analysis that helps in establishing a linear relation of voltage and current for R (resistance), L (inductance), and C (capacitance).