Electrical resistance is the measure of an electric circuit's ability to resist an electric current. There are several different terms that can be used as synonyms for electrical resistance including impedance, ohmic resistance, and resistivity. Impedance is a term used to describe how much a material or an object resists the flow of current in a circuit. Ohmic resistance refers specifically to the resistance in a circuit where the resistance remains constant over a range of voltage or current levels. Resistivity is another term that is used for electrical resistance. It more accurately measures a material's ability to conduct a current in relation to its dimensions and temperature.