py2 lab-4

# py2 lab-4 - Maria Tsiolkas Physics 212L:207 Charge and...

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Maria Tsiolkas Physics 212L:207 Charge and Discharge of a Capacitor October 23, 2008 October 30, 2008 Eleanor Hoffman Hanna Chong Katie Tran

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Introduction- The purpose of this lab is to observe the charging and discharging of a capacitor and measure the response time, which is used to determine the value of the element’s capacitance. Use an RC simple circuit with a capacitor. This allows for the investigation of ways to charge the effective capacitance by combining capacitors in series and parallel arrangements. A capacitor stores charge, and the voltage V across the capacitor is proportional to the charge q stored, given by the relationship V = q/C , where C is called the capacitance . A resistor dissipates electrical energy, and the voltage V across it is proportional to the current through it, given by V = R*(dq/dt) , where R is resistance. Useful Equations- V= Vf [1 – e^(-t/RC)] - ln [ (Vf – V)/Vf] = (1/RC)t Q = q initial e^(-t/RC) - ln [ (Vf – V)/Vf] = (t/RC) (chargring) V=Vinitial*e^(-1/RC) (discharging) slope=1/RC (time constant)= RC Ƭ Ceq(paralle)=C1+C2…+Cn Ceq(series)=(1/C1)+ (1/C2) …(1/Cn)
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