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# Lab E5 - McGee 1 Lab E5 Charge and Discharge of a Capacitor...

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McGee 1 Lab E5 Charge and Discharge of a Capacitor Allison McGee Mr. Fedorchak Thursday 2:00- 4:50pm Partners: Stevie Whitehead Trey Smith

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McGee 2 Abstract : The purpose of this lab was to measure the time constant of an RC circuit and find the capacitance. We observed a C value of 5.38 x 10 -3 F, compared to the accepted value of 4.7 x 10 -3 F. This yielded a percent difference of 13%. Introduction : The Capacitor was discovered accidentally in 1746. The jars stored large amounts of charge for long periods of time. Capacitance is given by the equation: C= Q/d V where C is the capacitance, Q is the charge stored in the capacitor and V is the voltage. When the switch on the circuit is open or it is charging, it follows the equation of: Q=Qmax (1-e (-t/RC)) where the Qmax is the final charge of the capacitor, t is the time in seconds, R is the resistance and C is the capacitance. When the switch is closed and the capacitor is discharging it follows the equation: Q=Qmaxe(=t/RC)
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