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Published byStephany Cobb Modified over 4 years ago

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Electricity

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whether two charges attract or repel depends on whether they have the same or opposite sign unit of measurement for charge is the coulomb (C) –one electron has a charge of 0.00000000000000000016 coulombs Charge

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Current comes from the motion of electrons is the rate at which electrons flow past a point on a circuit –measured in units called amperes, or amps (A) current

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Voltage a measure of electric potential energy voltage is an electrical force –measured in volts (V) a difference in voltage provides the energy that causes current to flow

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Circuits current only flows when there is a complete and unbroken path, or a closed circuit A circuit with a break is an open circuit and will trop the current. Example: light switch

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Electricity and Circuits (8:35) –http://www.youtube.com/watch?v=D2monVk CkX4&feature=relatedhttp://www.youtube.com/watch?v=D2monVk CkX4&feature=related

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series circuit –current can only take one path, so the current is the same at all points in the circuit

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parallel circuit –the current can take more than one path –each branch works independently

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Resistance –The measure of how strongly a wire or other object resists current flowing through it –The amount of resistance determines the amount of current for a given voltage. Higher resistance = less current. Full Current ½ current 1/3 current

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Conductors, Semiconductors and Insulators –Conductors: can conduct, or carry, electrical current. The resistance is low. Example: metals –Insulator: current cannot pass easily through these materials because the insulate, or block, the flow of the electrical current. Examples: rubber, glass, wood –Semiconductor – between a conductor and insulator. They carry electricity better than an insulator but not as good as a conductor. Examples include: silicon (used in computer chips, TV, portable radios)

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Insulator

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