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1 已知交流電壓 v(t)= v1(t)+v2(t)，若v1(t)=10sin(377t+30°)V ，v2(t)=10sin(377t-30°)V 則 v(t)為何？(99統測)
A v(t)=20sin(377t)V
B v(t)=17.3sin(377t)V
C v(t)=14.4sin(377t)V
D v(t)=10sin(377t)V
  

30° 60° 90°三角形比例`1:sqrt(3):2`，由圖可知，v(t)角度 0°，大小 `5sqrt(3)*2` =`10sqrt(3)` = 17.3V； `v(t)= 17.3sin(377t)(V)`