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Capacitors

Capacitors. Q V. V. Charge is forced on to primary plate by voltage. Charge is repelled off of secondary plate creating voltage. C =. Charging. A. p.d. across capacitor. R. Discharging. A. p.d. across capacitor. R. mA. mA. Set up this circuit and observe the current flow.

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Capacitors

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  1. Capacitors

  2. Q V V Charge is forced on to primary plate by voltage Charge is repelled off of secondary plate creating voltage C =

  3. Charging A p.d. across capacitor

  4. R Discharging A p.d. across capacitor

  5. R mA mA Set up this circuit and observe the current flow. Describe it as fully as you can.

  6. What should you have observed? • Current starts high and ends low (0) • Current reduces rapidly to begin with • Current reduces more slowly as time goes on So… Current discharge from a capacitor is Exponential

  7. V R C mA mA Use a voltmeter to investigate the relationship between R or C and the ‘half life’ of the voltage

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