resistance is the capacity of materials to impede the flow of current or, more specifically , the flow of electric charge . the circuit element used to model this behavior , with R denoting the resistance value ò the resistor.conceptually , we can understand resistance if we think abuot the moving electrons that make up electric current interacting with and being resisted by the atomic structure of the material through which they are moving. in the course of there interactions, some amount of electric enẻgy is converted to thermal energy and dissipated in the form of heat . this effect may be undesirable. however, many useful electrical devices take advantage of resistance heating, incluing stoves, toasters, irons, and space heaters.
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