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    14.素養(4)
1 有一交流電壓為v(t)=2202 sin(377t-45°)V,試求在t=1240 秒時之瞬間電壓值約為多少伏特? 106 統測
A 220
B 200
C 150
D 110

v(1240)=2202 sin( 377 × 1240-45° )

=2202 sin(120π× 1240-45°)

=2202 sin( π2-45° )

=2202 sin( 45° )

=2202 × 22

=220 V