- #1
kostoglotov
- 234
- 6
Homework Statement
imgur link: https://i.imgur.com/9jozS67.png
Homework Equations
The Attempt at a Solution
[/B]
Shouldn't I use [itex]V_{rms} = \sqrt{\frac{1}{T}\int_T v^2 dt}[/itex]?
Which would be
[tex]\sqrt{\frac{100}{2\pi}\int_0^{2\pi/100}(20+60cos(100t))^2dt}[/tex]
This equals [itex]\approx 79.88 V[/itex]
The answer is given as [itex]\approx 46.9V[/itex] and the solution manual shows the following working
[tex]\sqrt{20^2 + \frac{60^2}{2}}[/tex]
Why do they apply that solution and not the one I used?