Electric current that changes direction continually.
Alternating current
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Gum or resin from trees that has fossilized and turned solid.
Amber
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A device that stores electricity for future use.
Capacitor
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A path electricity follows, from a source through a connection to an output device.
Circuit
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A substance that allows electricity to pass through it.
Conductor
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The unit of measure of electrical charge.
Coulomb
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Electric current that flows only in one direction, such as that supplied by a battery.
Direct Current
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The amount of electrical energy stored in a battery, capacitor, or any insulated object that can hold energy for a time.
Electrical charge
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A form of energy associated with the presence and movements of electrical charges.
Electricity
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lamp that burns a filament in a vacuum in a glass bulb.
Incadescent Light Bulb
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When an electrical current is produced without any physical connection between the two parts of the circuit.
Induction
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A material that does not conduct electricity, or in other words, doesn't allow electricity to pass through it.
Insulator
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Unlike charges attract each other and like charges repel each other.
Law of Electric Charges
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A type of iron ore with a silvery finish, sometimes called magnetite.
Lodestone
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The push or pull of magnets, which are electrically charged with poles attracted to the North Pole or South Pole.
Magnetism
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The relationship, in a circuit using direct current, among voltage, current and resistance: One volt of electricity (E) is needed to force one ampere of current (I) through one ohm of resistance (R).