# Physics Ph2 Electrical definitions

• Created by: Matty1998
• Created on: 22-03-16 19:36
Coulomb
the amount of charge that passes a point when 1 amp flows for 1 second
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Ampere
One amp of current is a coulomb of charge being moved per second.
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Electric Current
the rate of flow of charge
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Ohms law
For a metallic conductor at a constant temperature, the current flowing through it, is directly proportional to the p.d. across it.
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Resistance
This is the p.d placed over a device divided by the current R = v/I
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P.d.
This is the electrical energy transferred into other forms, when a unit of charge is moved between two points.
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The volt
V=IxR This is the potential between two points in a circuit, if one joule of energy is converted into other forms when i 1 coulomb of charge moves between the points.
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Resistivity
this is the resistance of a sample of material of unit cross-a and unit length.
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Superconductivity
When a metallic conductor behaves like it has zero resistance
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Superconducting
The adjective used to describe materials that are below their transition temperature and therefore the resistance of which, is virtually zero
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Transition Temperature
The temperature below which the resistance of the metal suddenly drops to zero.
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The law of conservation of charge
electrical charge cannot be created or destroyed. As a consequence to this the current flowing to any point is equal to that flowing from it.
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The electro-motive force or E.M.F of a cell
The energy transferred to other forms, throughout the circuit, when unit charge passes through the cell.
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## Other cards in this set

### Card 2

#### Front

One amp of current is a coulomb of charge being moved per second.

Ampere

### Card 3

#### Front

the rate of flow of charge

### Card 4

#### Front

For a metallic conductor at a constant temperature, the current flowing through it, is directly proportional to the p.d. across it.

### Card 5

#### Front

This is the p.d placed over a device divided by the current R = v/I