Resistance

Resistance -- the ability of a material to impede the flow of charge


For example, the wires on the inside of a toaster or the coil on an electrical stove or a space heater are all objects that have electrons and resistance. 


"One way we get electrons to do something useful in an electrical circuit is to use a metal's resistance to convert the energy of the electrons speeding through the circuit into heat and light." 
--Exploring Creation with Physical Science by Dr. While (chapter 12 pg. 301)