6.已知訊號f(t)=8cos(2000πt+45°),下列何者分別為此訊號在時域的平均值及平均功率? (A)4及16 (B)0及32 (C)0及 22.624 (D)8及64
(c) Why the diode Dlin the buck converter below will turn-on after Ql tumn-of!? (3%)