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1 有一交流電壓為v(t)=110√2sin(377t+30°)V，求 t=1/30 秒時的瞬間電壓值為多少?(94統測)
A 55V
B 55√2V
C 110V
D 110√2V
  

`v(t)=110sqrt(2)sin(377t+30°)V`

`v(t)=110sqrt(2)sin(120πt+30°) V`

`v(1/30)` `=110sqrt(2)sin(120π1/30+30°) V`

`=110sqrt(2)sin(4π+30°) V`

`=110sqrt(2)(1/2)V`

`=55sqrt(2) (V)`