The pd between two points is the energy converted from electrical energy to some other form per coulomb of charge flowing from one point to the other. [Unit: V (= J C^-1)]
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Ohm's law
The current in a metal wire at constant temperature is proportional to the pd across it.
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Electrical resistance, R
The resistance of a conductor is the pd (V) placed across it divided by the resulting current (I) through it. R= V / I Unit:Ω (= VA^-1)
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Resistivity, ρ
The resistance, R, of metal wire of length L and cross-sectional area A is given by R = ρL / A, in which ρ the resistivity, is a constant (at constant temperature) for the material of the wire. Unit: Ω
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Superconductivity transition temperature, Tc
The temperature at which a material, when cooled, loses all its electrical resistance, and becomes super-conducting.
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Other cards in this set
Card 2
Front
The current in a metal wire at constant temperature is proportional to the pd across it.
Back
Ohm's law
Card 3
Front
The resistance of a conductor is the pd (V) placed across it divided by the resulting current (I) through it. R= V / I Unit:Ω (= VA^-1)
Back
Card 4
Front
The resistance, R, of metal wire of length L and cross-sectional area A is given by R = ρL / A, in which ρ the resistivity, is a constant (at constant temperature) for the material of the wire. Unit: Ω
Back
Card 5
Front
The temperature at which a material, when cooled, loses all its electrical resistance, and becomes super-conducting.
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