A material that allows the flow of electrical charge. Good conductors have a larger amount of free charge carriers to carry a current
Conductors
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The total charge in a system cannot change
Conservation of charge
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The flow from positive to negative, used to describe the direction of current in a circuit
Conventional current
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The unit of charge
Coulomb
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The rate of flow of charge in a circuit
Electric current
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Substances that contain ions that when dissolved in a solution, act as charge carriers and allow current to flow
Electrolytes
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The opposite direction to conventional current flow. Electrons flow from negative to positive
Electron flow
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The smallest possible charge, equal to the charge of an electron
Elementary charge
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A material that has no free charge carriers and so doesn't allow the flow of electrical charge
Insulators
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A consequence of the conservation of charge. The total current entering a junction must equal the total current leaving it
Kirchhoff's first law
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The average velocity of an electron passing through an object. It is proportional to the current, and inversely proportional to the number of charge carriers and the cross-sectional area of the object
Mean drift velocity
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The idea that charge can only exist in discrete packets of multiples of the elementary charge
Quantisation of charge
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A material that has the ability to change its number of charge carriers, and so its ability to conduct electricity. Light dependant resistors and thermistors are both examples
Semiconductors
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Other cards in this set
Card 2
Front
The total charge in a system cannot change
Back
Conservation of charge
Card 3
Front
The flow from positive to negative, used to describe the direction of current in a circuit
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