31. Alternating Current

The following phasor diagram shows an arbitrary phasor during its first rotation. Assuming that it begins with an angle of 0° , if the phasor took 0.027 s to get to its current position, what is the angular frequency of the phasor?

An AC source oscillates with an angular frequency of 120 s^-1 . If the initial voltage phasor is shown in the following phasor diagram, draw the voltage phasor after 0.01 s.

A phasor of length 4 begins at 0°. If it is rotating at ω = 250 s⁻¹, what is the value of the phasor after 0.007 s?

Which of the following best describes the relationship between three voltages $V_1$, $V_2$, and $V_3$ in a phasor diagram if $V_1$ and $V_2$ are out of phase and their sum gives $V_3$?