And lessons learned in the past to talk about electric field and electric potential is more or less the same because there is the one without the other. From now on we will remove the electric field with the potential to stay and we will say, "an electric potential is used to move loads" which is absolutely true. However, the charges can move in different ways: either are loose and dragged around a potential or take advantage of the metals have excess free charges and make these circulate within it porter cable jetstream. Put another way: through an electric potential (battery, battery, solar cell, generator, thermocouple, etc. ) and taking advantage of the metal are free of the burdens that we can have these charges circulated by applying the above potential. This, in itself, may not be too interesting or even helpful, we have a porter cable jetstream for which the electrons are like crazy porter cable jetstream. but let's put porter cable jetstream in the middle of the filament of a lamp, then the electrons are going to meet with an obstacle, it will hit again and again against the crystalline structure of tungsten. and they are going to heat up!. then we have a stove or lamp if the filament is hot porter cable jetstream. or both. Or maybe the "mainstream" of electrons we please send it to an electronic device and it will do amazing things (phone, TV, radio, compu, etc). What makes that relates the voltage with the flow and determine how much voltage is needed for something, or how much current flows for something neither more nor less than the "Ohm's Law porter cable jetstream. ". . porter cable jetstream. .