Units and PWM power
P_res = C * V_peak^2 * f_sw. nH, µH, mH, and H become henry. pF, nF, and µF become farad. Hz, kHz, and MHz become hertz. The same physical value keeps the same result.
The AC equation is not used because X_c is not defined.
RC snubber C, R, and loss
P_res = C * V_peak^2 * f_sw. nH, µH, mH, and H become henry. pF, nF, and µF become farad. Hz, kHz, and MHz become hertz. The same physical value keeps the same result.
The AC equation is not used because X_c is not defined.