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| The difference in electric potential (voltage) between two points. Free charge flows when there is a difference and will continue until both points reach a common potential. |
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| The flow of electric charge; measured in amperes (C/s). |
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| SI unit of electric current. A flow of one coulomb of charge per second is one ampere (symbol A). |
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| A device, such as a battery or generator, that provides a potential difference. |
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| The resistance of a material to the flow of electric current through it; measured in ohms. |
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| A property of a material that has infinite conductivity at very low temperatures, so that charge flows through it without resistance. |
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| The SI unit of electric resistance. One ohm is the resistance of a device that draws a current of one ampere when a voltage of one volt is impressed across it. |
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| The statement that the current in a circuit is directly proportional to the voltage impressed across the circuit, and is inversely proportional to the resistance of the circuit. |
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| Electric current whose flow of charge is always in one direction. |
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| Electric current that repeatedly reverses direction, twice each cycle. Usually at 60 cycles per second, or hertz (Hz) , in North America, or 50 hertz elsewhere. |
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| An electronic device that restricts current to flow in a single direction in an electric circuit. |
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| The rate at which electrical energy is converted into another form, such as light, heat or mechanical energy (or converted from another form into electrical energy). |
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| Potential difference; measured in volts |
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