and what is its purpose? what does a resistor actually do? My understanding is that electrical resistance is sort of like electrical friction, or imagine sitting in a car, with your hand out of the window, as the car speeds up, you feel more resistance against your hand, and it takes more energy to hold your hand there as the car gets faster and faster. the wind in this case is the current, and the hand is feeling the resistance. Also as the current gets higher, the more electrical resistance it encounters, to get the amount of current 'under control' so to speak so that the resistance doesnt get out of hand, a resistor sort of 'eats' or 'resists' the electrical current, so there isnt too much current and as a result there isnt too much electrical resistance. Does this make any sense? Am i correct on this? Also Electrical potential energy is the amount of energy it takes to move charges across a circuit,and that energy is lost while the charges move across the circuit, that energy is lost in 2 ways, its either used up ( converted into light and heat if there is a bulb present) or that energy is lost just carrying the electrical charges over the circuit. Is this true also?