Lightweight pith balls help to show electrostatic attraction and repulsion.
In a generator, fuel is burned to turn an armature which changes the amount of magnetic field through a coil of wire. This change in the amount of field makes a current flow in the coil. This effect can be observed with this simple demonstration in which a strong magnet causes current to flow in a solenoid.
The ion wind from the sharp tip of a charged conductor causes the conductor to move.