[SOLVED] Help equation to find # of electrons 1. The problem statement, all variables and given/known data Just as you touch a metal door knob, a spark of electricity (electrons) jumps from your hand to the knob. The electric potential of the knob is 2.0*10^4 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? 2. Relevant equations -W/Va-Vb=C 1e = 1.6*10^-19 Coulombs 3. The attempt at a solution 1.5E-7 / 2E4 = 7.5E-12 7.5E-12 / 1.6E-19 = 4.7E7 Electrons.