# AC circuit voltage can be described using a sine wave with the equation??

Discussion in 'Electronics Homework Help' started by Andrew Younger, Jan 11, 2017.

1. ### Andrew Younger

2
0
Jan 11, 2017
Hi I am having a bit of trouble with a question and hoping I may be able to get a few pointers in the right direction.

The question is:
In an AC circuit the voltage can be described using a sine wave with the equation: v = 150sin (60 pi t + 0.6) V

I need to work out
a. the frequency
b. the amplitude
c. the relative phase

I know that the amplitude is 150v so that is (b) taken care of, I am now unsure how to work out the following despite scouring the internet and my reading material. Does anyone know what the numbers in the brackets stand for?

Thanks

2. ### Alec_t

2,950
803
Jul 7, 2015
v = amplitude x sin((2 x pi x frequency x time) + phase).
Compare that equation with the one you have been given.
Welcome to EP.

3. ### Kabelsalat

157
29
Jul 5, 2011
Here is the output curve, compared with a similar one without phase shift:

It is much easier to understand by seeing the function curve.

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4. ### Laplace

1,252
184
Apr 4, 2010
The quantity in the parentheses is given in radians. There are 2π radians in 360°. So are you expected to give the frequency in radian measure or in Hz? Phase shift in radians or degrees?

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