问题
选择题
一交流电压随时间变化的规律如图所示，该交流电压的有
效值和周期分别是
A．14.14V,0.0ls
B．l0V,0.0ls
C．14.14V,0.02s
D．l0V,0.02s
答案
答案：C
根据凸显可知，交流电的最大值为14.14V，所以交流电的有效值为U=
=10V，根据图象可知，交流电的周期为0.02s，所以C正确．
搜题请搜索小程序“爱下问搜题”
一交流电压随时间变化的规律如图所示，该交流电压的有
效值和周期分别是
A．14.14V,0.0ls
B．l0V,0.0ls
C．14.14V,0.02s
D．l0V,0.02s
答案：C
根据凸显可知，交流电的最大值为14.14V，所以交流电的有效值为U==10V，根据图象可知，交流电的周期为0.02s，所以C正确．