In this applet you can study a) a single phase voltage that is given by the equation[b] U=Uo*sin(ωt) [/b]where [b]Uo [/b]stands for the maximun voltage[b] ω [/b] for 2πf (f for frequency) t for time. b) from the equation [b] U=Uo*sin(ωt-φ)[/b] the phase - lead or [b]U=Uo*sin(ωt+φ) [/b]phase lag, where φ stand for the angle that is given by the various rates for example 2π/3 or π/4. by giving a 120o angle between the 3 voltages you demonstrate the 3 phase voltage