一正弦交流电压波形如图所示,其瞬时值表达式为()伏。
A: u=10sin(ωt-π/2)\n
B: u=10sin(ωt+π)\n
C: u=-10sin(ωt-π/2)\n
D: u=-10sin(ωt+π)
A: u=10sin(ωt-π/2)\n
B: u=10sin(ωt+π)\n
C: u=-10sin(ωt-π/2)\n
D: u=-10sin(ωt+π)
举一反三
- 一正弦交流电压波形如图所示,其瞬时值表达式为()伏。 A: u=10sin(ωt-π/2) B: u=10sin(ωt+π) C: u=-10sin(ωt-π/2) D: u=-10sin(ωt+π)
- 一个正弦交流电压波形如下图所示,其瞬时值表达式为。 A: u=10sin(ωt-π/2)V B: u=-10sin(ωt-π/2)V C: u=10sin(ωt+π)V D: u= -10sin(ωt+π)V
- u=- 10sin(5πt+ 10)V超前i= 5cos(5πt - 150)A的相位差是
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- 3.11 在纯电感电路中,若u=UmsinωtV,则i为()。 A: i=(Um/ωL)sin(ωt+π/2)A B: i=Umωsin(ωt-π/2)A C: i=(Um/ωL)sin(ωt-π/2)A D: i=Umωsin(ωt+π/2)A