求瞬时值已知u=100sina(314t+90°）V,试求t分别为0、0.005、0.01、0.015、0.02s时u的瞬时值,画出波形图.这个怎么算,

Question

求瞬时值
已知u=100sina(314t+90°）V,试求t分别为0、0.005、0.01、0.015、0.02s
时u的瞬时值,画出波形图.
这个怎么算,

Answer 1

t=0
u=100sin(314*0+90)=100sin(90)=100 V
t=0.005
u=100sin(314*0.005+90)=100sin(91.57)=99.96 V
t=0.01
u=100sin(314*0.01+90)=100sin(93.14)=99.85 V
横坐标为时间t,纵坐标为u即可画出波形图