#2 the difference between the two is that the voltage pushes the electrons and voltage drop is the effect of the voltage pushing its self through a load
#3b so if i need to find current id need to do I=E/R
#3c so to calculate voltage drop you would need to do E=I*R
#3d so no matter what the current stays the same and resistance affects the amps and voltage mostly
#3f to calculate watts id need to do P=I^2/R