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Electric Charge

Electric Charge. Charge can be transferred between objects Amount of charge lost = amount of charge gained Ways to charge: 1. Conduction 2. Induction Like charges repel Opposite charges attract. Coulomb’s Law.

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Electric Charge

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  1. Electric Charge • Charge can be transferred between objects • Amount of charge lost = amount of charge gained • Ways to charge: 1. Conduction • 2. Induction • Likecharges repel • Opposite charges attract

  2. Coulomb’s Law The amount of force between two objects is dependent upon two things: 1. The amount of charge of each present 2. The distance between the two charges Felectric = kq1q2 k = coulomb’s constant r2 9.0 X 109 N*m2/C2

  3. Electric Force is a field force • Goes out in ALL directions (not just one) • Represent electric field force with lines • Draw lines going out for (+) charges • Draw lines coming infor (-) charges • The stronger the electric force • 1. the greater the # of lines drawn • 2. the closer they are drawn together

  4. Circuits Parallel Parts of: Battery Provides voltage Wire Path for charge to flow Provides some resistance Bulb Uses current Provides some resistance Switch Regulates flow of charge Series

  5. Voltage (electric potential) = the change in potential energy as a charge moves from one place to another • Unit is Volts (V) • Current- the amount of charge passing through the circuit • Unit is Amperes-Amps (A) • Resistance – opposition to the flow of current • Unit is Ohm’s () VoltageCurrentResistance V = PE I = QR = V q t I Ohm’s Law

  6. Power – the rate at which charge does work P = IV = I2R = (V)2 R Electric Current is used for energy E = Pt = I2Rt = V2t R

  7. Series Circuits • The CURRENT stays the SAME throughout the circuit • The TOTAL RESISTANCE (equivalent resistance) is the SUM of all the resistors in the circuit • The TOTAL VOLTAGE is the SUM of the voltage drop across each resistor in the circuit Parallel Circuits • The TOTAL CURRENT is the SUM of the current across each resistor in the circuit • The EQUIVALENT RESISTANCE is the following: 1/Req = 1/R1 + 1/R2 + 1/R3 • The VOLTAGE is the SAME throughout the circuit

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