magnetic flux is the magnetic field measured in webers. You should read up on electromagnetic induction. http://en.wikipedia.org/wiki/Electromagnetic_induction
I am an electrician. The neutral is only bonded to ground at the main service, and nowhere else. Odd voltage problems are usually caused by problems with neutrals.
Impedence is the total opposition to current flow. You can add resistance and reactance vectorally or just do an impedance triangle. Resistance is your x axis, reactance is your y axis, and the impedance is your hypotenuse, and the angle between converts to your power factor. But as Notime said...
Well first of all if you plug a generator into a wall outlet you should shut off your main breaker. In the event of a power outage you'd end up backfeeding the city transformer, and energizing the primary side which could kill someone working on the line. Anything that you power up will only...
If the dishwasher was off and you still get a voltage from chassis to ground there could be a problem with the neutral. It may be bonded to ground somewhere creating a loop in the grounding system.