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21 Cards in this Set
- Front
- Back
- 3rd side (hint)
An electrical property of matter that creates a force between objects.
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What is an Electric Charge? (430)
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Like _______ repel while opposite _____ attract. They can be Positive or Negative. Ex. a balloon (-) clinging to your hair (+) shows attraction
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A material that transfers charge easily.
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What is a Conductor? (432)
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Ex. copper, gold, aluminum,& most metals
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A material that does not transfer charge easily.
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What is an Insulator? (432)
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Ex. plastics, pvc, rubber, glass, cardboard, silk, etc.
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The force of attraction or repulsion between objects due to charge.
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What is an Electric Force? (434)
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This depends on charge and distance and acts through a field.
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The region around a charged object in which other charged objects experience an electric force.
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What is an Electric Field? (435)
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This can be shown by drawing lines that point in the direction of the electric force on a positive charge (outward).
A negative charge is drawn with lines pointing inward. |
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The potential energy of a charged object due to its position in an electric field.
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What is Electrical Potential Energy? (437)
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This decreases between two negative charges as the distance between them increases. Also true for both attractive and repulsive forces.
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The change in the electrical potential energy per unit charge.
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What is the Potential Difference? (438)
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The change in the EPE of a charged particle divided by its charge. SI unit for measurement is the volt. v = 1 joule per coulomb (voltage)
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A device that is a source of electric current because of a potential difference, or voltage, between the terminals.
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What is a Cell? (438)
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Voltage across the + & - terminals of a battery range from 1.5v (dry cell) to about 12V (wet cell)for a car battery.
Electrochemical ______ contain an electrolyte, a solution that conducts electricity, and two electrodes, each with different conducting material. |
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The rate that electric charges move through a conductor.
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What is a Current? (439)
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SI unit for _________ is the ampere.
1 amp equals 1 C of charge moving past a point in 1 second. |
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The ratio of the voltage across a conductor to the current it carries.
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What is Resistance? (441)
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Caused by internal friction, which slows the movement of charges through a conducting material.
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R = V/I
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Resistance = Voltage divided by Current
SI unit of resistance = the ohm (same as volts per ampere) |
Ex. The resistance of the filament of a light bulb determines how bright the bulb is.
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A special type conductor used to control current.
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What is a Resistor? (442)
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Ex. The current in a 10 ohm resistor is half the current in a 5 ohm resistor.
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R = V/I & IR = VI/ I & V = IR
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What is the equation for Resistance, Current, and Voltage.
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Metals or compounds that have zero resistance when their temperature falls below a certain temperature. Used in electrical devices like filters, powerful magnets, and Maglev high-speed express trains.
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What are Superconductors? (444)
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Ex. metals including niobium, tin, mercury, and the metallic compounds containing barium, copper, & oxygen.
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A class of materials with electrical properties between those of insulators and conductors.
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What are Semiconductors? (445)
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Ex. Silicon and germanium are used for this in computer boards
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An electrical device connected so that it provides one or more complete paths for the movement of charges.
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What is an Electric Circuit?
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Ex. bulb, battery & wires make a _____.
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A graphic representation of an electric circuit or apparatus, with standard symbols for the electrical devices.
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What is a Schematic Diagram? (447)
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All electrical devices have these diagrams for their production and maintenance.
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A circuit or portion of a circuit that provides a single conducting path.
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What is Series?
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Ex. All bulbs/devices fail if this type circuit has an opened switch, cut wire, blown bulb or other type interruption.
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Describes components in a circuit that are connected across common points, providing two or more separate conducting paths.
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What is Parallel? (449)
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A break in any one path in this type circuit does not interrupt the flow of electric charge in the other paths.
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The energy associated with electrical charges, whether moving or at rest.
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What is Electrical Energy? (450)
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Creates electrical power (rate at which electrical work is done). This is the product of total current(I)in and voltage (V)across a circuit.
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P = IV or I = P/V or V = I/P
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Power = current x voltage
Current = power divided by voltage Voltage = current divided by power |
P = I exp.2R = Vexp.2/ R for Power lost or dissipated. SI unit for power is the watt named for Scottish inventor James Watt.
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