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10 Cards in this Set
- Front
- Back
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potential difference
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The difference in voltage between two points, measured in volts. It can be compared to the difference in water pressure between two containers: If two containers having different water pressure ware connected by a pipe, water will flow from the one with the higher pressure to the one with the lower pressure until the two pressures are equalized. Similarly, if two points wtith a difference in potential are connected by a conductor, charge will flow from the one with the greater potential to the one with the smaller potential so long as a potential difference is maintained.
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Electric current
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The flow of electric charge that transports energy from one place to another. Measured in amperes, where 1 A is the flow of 6.25X 10^18 electrons per second, or 1 coulomb per second
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Electrical resistance
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The property of a material that resists electric current. Measured in Ohms.
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Superconductor
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A material in which the resistance to electric current drops to zero under special circumstances that usually include low temperatures.
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Ohm's law
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The statement that the current in a circuit varies in a direct proportion to the potential difference or voltage and inversely with resistance.
Current = voltage/resistance A potential difference of 1 V across a resistance of 1 ohm produces a current of 1 A |
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Direct current (dc)
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An electric current consisting of charges flowing in one direction only
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Alternating current (ac)
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Electric current that repeatedly reverses its direction; the electric charges vibrate about relatively fixed points. In the United States the vibrational rate is 60 hz
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Electric power
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The rate of energy transfer, or the rate of doing work; the amount of energy per unit time, which electrically can be measured by the product of current and voltage. Power= current X voltage, Measured in watts (or kilowatts), where 1A X 1V= 1W
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Series Circuit
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an electric circuit with devices connected in such a way that the electric current is the same through each of them
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parallel circuit
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An electric circuit with two or more devices connected in such a way that the same voltage acts across each one and any single one completes the circuit independently of all the others
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