Quick instantaneous sin value question

Thread Starter

markp912

Joined Feb 4, 2009
14
Q: A certain sin wave has a positive going zero crossing at 0° and an rms value of 20V. Calculate its instantaneous value at each of the following angles: (a)15° (b)33° (c)325°

So my Vp=28.28
But since my starting point is at 0° would that mean each of those angles are lagging and i would have to use the formula: y=Vp sin(θ-Φ)?

Or would i just use y=Vpsinθ

Thank you.
 

RiJoRI

Joined Aug 15, 2007
536
WHY are they lagging? Lagging in regard to what? And why couldn't you return the values as RMS?

Methinks thou art working too hard!

--Rich
 

Thread Starter

markp912

Joined Feb 4, 2009
14
WOW! that picture did help a lot. i feel like an idiot now. there is only one sine wave going. thanks for all of your help guys.
 
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