PHY2061 R. D. Field Department of Physics chp31_4.doc University of Florida Charging a Capacitor After the switch is closed the current is entering the capacitor so that I = dQ/dt, where Qis the charge on the capacitor and summing all the potential changes in going around the loop gives ε−−=IRQC0, where I(t)and Q(t)are a function of time. If the switch is closed at t=0 then Q(0)=0and −−=RdQdtQC0, which can be written in the form ()QC=−−1τ, where I have define τ=RC. Dividing by (Q-εC) and multiplying by dt and integrating gives
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This note was uploaded on 05/31/2011 for the course PHY 2061 taught by Professor Fry during the Spring '08 term at University of Florida.