The resistance of a given piece of wire or conductor depends on four factors: the length of the wire, the cross-sectional area of the wire, the resistivity of the material composing the wire and ...

This article was originally published with the title “Resistance of Electrical Conductors when in Motion” in SA Supplements Vol. 1 No. 19supp (May 1876), p. 302 doi:10.1038 ...

They have a high resistance and are called insulators . Non-metals are poor conductors because they have very few free electrons. This makes it difficult for electrical current to flow through them.

A superconductor is a material that achieves superconductivity— a state of matter that has no electrical resistance and does not allow magnetic fields to penetrate.

According to IEEE standards, a connection is considered to have failed electrically if the resistance is the same or greater than the line, a resistance ratio (RR) of 1.0 or greater. With a RR of 1.0, ...

The National Electrical Code (NEC) addresses all different forms of electric heat tracing in Art. 427. Among the methods addressed are: Impedance Heating Systems; Induction Heating Systems; Resistance ...

Insulation failure is the root cause of many electrical conductors and equipment failures. When insulation fails, not only can equipment be damaged, but fire and shock can also result. Ideally, when ...

In conventional superconductors, atomic vibrations induce the electron pairing. Most of these materials need to be chilled below 20 K before they shed electrical resistance.