The kilowatthour meter only measures real power consumed, and ignores the reactive power. So you won't save anything on the electric bill with the capacitors. The residential electric rate probably assumes some reactive power factor anyway, but they don't measure individual customers for it.
Also notice that the motor in that demo on youtube appears to have no load on it, so the real power amperage is a lot lower than if the motor was driving something.
Oh, if you have a circuit breaker that trips out, reducing the power factor of a motor on that circuit with a capacitor may be enough to get the current down so the breaker doesn't trip anymore, but such a branch circuit shouldn't be so heavily loaded anyway.
there's a type of math that accounts for things that change over time. It's called 'calculus.'
I enjoyed calculus so much, I took it twice back in college... :-)
