某正弦交流电压为u=220sin(314t+30°)V,此交流电压的最大值为()
A: 240V
B: 220V
C: 0.1
D: 30V
A: 240V
B: 220V
C: 0.1
D: 30V
举一反三
- 某正弦交流电压的最大值为311V,周期为0.02s、初相为30°,则该正弦交流电压的表达式为 A: u=220sin(314t-30°)V B: u=220sin(314t+30°)V C: u=311sin(314t-30°)V D: u=311sin(314t+30°)V
- 已知正弦量u=220sin(314t+30°)V,则其电压最大值Um为()V。 A: 110 B: 155 C: 220 D: 220
- 已知一正弦电动势的最大值为220V,频率为50Hz,初相位为30。,此电动势的瞬时值表达式是() A: e=220sin(314t+30°)v B: e=220√2sin(314t+30°)v C: e=220Sin(314t一30°)v D: e=220√2sin(314t一30°)v
- 已知电压U=220∠30°V,该电压的三角函数式为() A: u=220√2sin(ωt+30°)V B: u=220sin(ωt+30°)V C: u=220√2sin(ωt-30°)V D: u=220sin(ωt-30°)V
- 某工频正弦电压的最大值为310V,初相为30°,则电压的瞬时值表达式为() A: (a)u=310sin(314t+30°)V B: (b)u=220sin(314t+30°)V C: (c)u=310sin(628t+30°)V D: (d)u=220sin(628t+30°)V