1. The problem statement, all variables and given/known data We are given a passive RC low pass filter with an input voltage of 5 Vrms at a frequency of 1 kHz. The resistor has a value of 22 kΩ, the capacitor a value of 100 nF. There is a current i accross the resistor. (see picture below) We are to calculate the magnitude and phase angle of the output voltage. By the way, in the picture below is in german, so V eff means rms, I think the rest should be apparent. 2. Relevant equations UR = R*I Uout = I*XC XC = I / ω*C ω = 2*π*f (in rad/s) 3. The attempt at a solution Analytically, this is not a problem, and I have attached the solution from the professor. My only problem is that for ω the professor used the frequency f, and not 2πf. As in: ω = f = 1 kHz This makes no sense to me and seems wrong. Could somebody possibly clarify what´s going on here? Thanks in advance.