Engineering Can someone explain me what happen in this step? Circuits 1

AI Thread Summary
The discussion revolves around understanding a step in a circuit analysis problem, specifically regarding the phase shift in the current function. The original sine function was converted to a cosine function, which introduced a phase shift of π/2. Participants clarified that this change is a standard practice in trigonometric representations of alternating current. The user seeking help expressed gratitude after receiving the explanation. The conversation highlights the importance of recognizing phase shifts in circuit analysis.
sammyqw
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Homework Statement


http://imgur.com/tQR7Jdt
tQR7Jdt.png

Homework Equations


xc= vm/im

The Attempt at a Solution


http://imgur.com/a/RwIUA
zpEVacj.png

Can someone please explain where did they get that pi/2 ? did they integrate 2cos(10t)or something? Thanks
 
Last edited by a moderator:
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They changed the trig function used to describe the current from a sine function to a cosine function. This just involves a phase shift.
 
thank you i see now
 

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