a) Capacitors

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9 Terms

1
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  • capacitor


  • a component that stores charge by separating it across two plates


2
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  • the structure of a capacitor


  • two metallic plates separated by a dielectric


3
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  • dielectric


  • an insulator


4
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  • when charging an capacitor…


  • electrons flow

  • plate one gains electrons

  • electrons cannot travel through the dielectric

  • plate one is negatively charged

  • electrons leave plate two

  • plate two is negatively charged


5
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  • the capacitor is fully charged when…


  • the current in the circuit = 0A

  • the PD across the capacitor = the EMF of the EMF source


6
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  • the net charge of a capacitor is…


  • 0A


7
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  • the net charge of a capacitor is 0A because…


  • the current in the circuit is equal at all points

  • total charge is conserved in a closed system

  • the negative charge of plate one = the positive charge of plate two


8
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  • capacitance


  • the charge stored by a capacitor per unit of PD across it


9
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  • the formula for capacitance


  • C = Q/V

    • C = capacitance (F)

    • Q = charge stored (C)

    • V = potential difference (V)