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18 Cards in this Set
- Front
- Back
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Charge |
Current multiplied by the time. |
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Electric current |
A flow of charge. |
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One coulomb |
The total charge supplied by a current of one ampere in a time of one second. |
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Conductors |
A material with a high number density of conduction electrons and therefore a low resistance. |
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conventional current |
A model used to describe the movement of charge in a circuit. Conventional current travels from + to -. |
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Electron flow |
The movement of electrons from - to +. |
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Resistance |
A property of a component that regulates the electric current through it. |
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Kirchhoff's first law |
The sum of the currents entering any junction is always equal to the sum of the current leaving the junction. |
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Electrolyte |
A fluid that contains ions that are free to move and conduct electricity. |
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Insulators |
A material with a small number density of conduction electrons and therefore a very high resistance. |
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semiconductor |
A material wit ha lower number density of conduction electrons than a conductor and therefore a high resistance. |
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Electromotive force e.m.f. |
The electrical energy transferred per unit charge when one form of energy is converted into electrical energy, measured in volts(V) and potential difference. |
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Ohm's law |
The current through a conductor is proportional to the potential difference across it, provided physical conditions, such as temperature, remain constant. |
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Components |
Parts of electric circuits, including bulbs, LDRs, etc. |
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I-V characteristic |
A graph to show how the electric current through a component varies with the potential difference across it. |
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Potential difference |
The electrical energy transferred per unit charge when electrical energy is converted into another form of energy. |
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Kelvin |
SI unit of temperature. |
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Kirchhoff's second law |
In any closed loop in a circuit the sum of the e.m.f.s is equal to the sum of the p.d.s. |
