A cosine wave voltage signal has a 10V RMS value and 60Hz frequency. Also at time, t = 0, the value of the voltage signal is equal to its RMS value. Which of the following is the correct mathematical representation of the voltage signal?
1
10 cos(60t)
2
10 cos (120πt)
3
14.14 cos (60t + π/4)
4
14.14 cos (120πt + π/4)