1. The opposition that a device or material offers to the flow of direct current, equal to the voltage drop across the element divided by the current through the element.
2. The opposition to a flow of electric current through a circuit component, medium, or substance.

It is the magnitude of the actual part of the impedance and is measured in ohms.

1. A refusal to accept something: Little Susi put up a lot of resistance when told she should put on her pyjamas and go to bed!
2. Opposition offered by one force to another: The aggressive mob presented no resistance to the police officers when asked to disperse.
3. Immunity of a person's body toward diseases and germs: Somehow Tom showed good resistance in getting the flu like everybody else in his family.
4. The force that decelerates a moving vehicle or object: Most cars are made to lessen wind resistance by being very smooth and without any sharp hinderances.
5. The absence of responsiveness to an insecticide, drug, etc.: Some plants and insects have shown resistance to certain chemicals caused by continued exposure or genetic variation or mutation.

An electric furnace in which the heat is developed by the passage of current through a suitable internal resistance that may be the charge itself, a resistor embedded in the charge, or a resistor surrounding the charge.

1. A material's opposition to the flow of electric current which is measured in ohms.
2. The difficulty electrons have moving through a conductor or substance.
3. The opposition to the flow of electrical current between two points of a circuit.

Any instrument which measures electrical resistance.

1. A thermometer in which the sensing electrical element is a resistor whose resistance is an accurately known function of temperature.
2. Temperature sensors that exploit the predictable change in electrical resistance of some materials with changing temperatures.