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16 Cards in this Set
- Front
- Back
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Circuit
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A closed path through which electrons (electricity) flow.
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Conductor
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A material that allows electrons to move easily through it.
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Current
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The flow of electrons through a wire or any conductor; measure in amperes (A) with an ammeter.
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Dry Cell
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A power source that acts as an electron pump and generates electric current by a chemical reaction; “dry” because it uses a thick, pasty electrolyte.
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Electric Field
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An area surrounding an electron that exerts a force on anything nearby with an electric charge; is strongest nearest the electron and weakens with distance.
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Electrical Power
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The rate at which electrical energy is converted to another form of energy; electrical power is expressed in watts (W) or kilowatts (kW),
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Electroscope
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A device containing two suspended metal leaves in a jar that move apart when charged; used to detect the presence of electric charges.
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Insulator
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A material that does not allow heat or electrons to move through it easily.
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Kilowatt-hour
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The unit of electrical energy; 1 kilowatt-hour (kWh) = 100 watts (W) of power used for 1 hour.
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Ohm’s Law
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States that potential difference = current x resistance,
or V (volts) = I (amperes) x R (ohms). |
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Parallel Circuit
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An electrical circuit where the current flows through more than one path. If one path is interrupted, current will still flow through the other paths.
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Potential Difference
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The difference in electric potential energy between two different points; measured in volts (V).
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Resistance
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The opposition to the flow of electrons through a conductor; measured in ohms.
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Series Circuit
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An electrical circuit where the current has only one path. If the path is interrupted in any point, it stops current flow in the entire circuit.
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Static Electricity
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The net buildup of electric charges on an object.
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Wet Cell
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A power source that generates electric current by a chemical reaction; “wet” because it uses a liquid electrolyte.
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