Electrical resistors
Electric resistance furnaces - Application technologies
Article REF: D5911 V1
Electrical resistors
Electric resistance furnaces - Application technologies

Authors : Jean-François BOURGEOIS, Alain GIRAULT, Richard JAUME, Marianne LE BOULCH, Claude OBERLIN

Publication date: February 10, 2005 | Lire en français

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1. Electrical resistors

1.1 Resistance and resistivity

The value of the resistance R (Ω) of a heating element of length l (m), uniform cross-section S (m 2 ) and resistivity ρ (Ω · m) is given by the relationship : R=ρ(l/S)

The inverse of resistance C = 1/R is conductance.

Resistivity varies with temperature according to :

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