Unit 2.2 Physics

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Potential difference (pd), V
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

Preview of the back of card 3

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

Preview of the back of card 4

Card 5

Front

The temperature at which a material, when cooled, loses all its electrical resistance, and becomes super-conducting.

Back

Preview of the back of card 5

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