Resistance, or impedance, decreases electrical current per Ohm's law. Ohm's law gives current as a ratio of voltage to resistance: 1 volt flowing through 1 ohm of resistance produces 1 ampere of current. Resistance is th... More »

Electrical resistance in metals is caused by the temperature of the metal or impurities in the metal. Both increases in temperature and higher levels of impurities impede the flow of electricity through the metal materia... More »

The resistance of a typical conducting wire is low when temperature is low and high when temperature is high. The increase in resistance alongside temperature is due to an increase in energy of the wire atoms, which caus... More »

Some electrical formulas include Ohm's Law, which states that voltage equals current times resistance, and the formulas associated with Kirchhoff's Laws, one of which states that the sum of all voltages must add up to 0.... More »

Electrical currents always follow the path of least resistance. They require three conditions in order to flow: a difference in voltage between two points, a conductive path and a closed circuit. When these conditions ar... More »

When a short circuit occurs, electrical current experiences little to no resistance because its path has been diverted from its normal direction of flow. This in turn produces excess heat and can damage or destroy an ele... More »

Some of the basics of electrical engineering are current, voltage and resistance. These are three of the essential building blocks of electricity, and it is important to understand electricity at a fundamental level befo... More »