I understand that power(watts) is equal to voltage(potential energy) X current(flow of electrons). I understand that is is more efficient to increase the voltage using a tansformer to send less current but come out with the same power. i.e 12 volts X 10 amps = 120 watts 24 volts x 5 amps = 120 watts but how does less amps/current give the same power output? Would half the current travel twice as fast? I understand current to be electrons moving along a copper wire in a magnetic field so if I doubled the voltage I would end up with half as many electrons but moving twice as fast? Perhaps similar to bandwidth in a computer where a 1 Ghz processor can send data down a 16 bit bus at the same speed a 500Mhz processor can send data on a 32 bit bus.