Does a source of electricity ever run out of electrons?

Just as you touch a metal door knob, a spark of electricity(electrons) jumps from your hand to the knob. The electricpotential of the knob is 2.0 104 V greater than that of your hand.The work done by the electric force on the electrons is 1.5 10-7 J.How many electrons jump from your hand to the knob?

Electricity is the flow of electrons. The following questions relate to how electricity is quantified.

Electrons are charged particles. The amount of charge that passes per unit time is called?

The driving force for the electrons (i.e., the reason they are flowing in the first place) is measured by?

The charge is measured in?

Current is measured in?

Potential is measured in?

At what distance from a 25 W point source of electromagnetic waves is the electric field amplitude 160 V/m?