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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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**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. Describe it as fully as you can.**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**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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