Capacitors

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  • Created by: henryj
  • Created on: 18-02-14 11:35
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  • Capacitors
    • Defintion
      • A capacitor is two plates on a circuit separated by an insulator
    • Capacitance
      • Defined as the amount of charge stored per volt
    • Store Energy
      • E= 1/2 CV^2
      • E=1/2 QV
    • Time Constant
      • T= RC
      • Time taken for the charge on a discharging capacitor to fall to 37% or the charging capacitor to rise to 63%
    • Time taken to charge or discharge depends on two factors
      • Capacitance
        • This affects the amount of charge that can be transferred at a given voltage
      • Resistance
        • This affects the current in the circuit
    • When connected to a battery a current flows until capacitor is fully charged

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