EE 2950 Chapter : Chapter 04part1
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Rc circuit: initially capacitor c is fully charged. Close switch : capacitor is discharging: charge q(t) on c decreases with time, until q=0, voltage across c decreases with time until vc(t)= 0. Voltage across c can not change instantaneously: current i(t) decreases to i=0, when c is fully discharged, voltage across r decreases, vr(t)= i(t)r (to vr(t)= 0 when c fully discharged) Solving the differential equation dv t c. 0)( c tv c ev i t v. Rc v c i is the circuit ti. Figure 4. 2 voltage versus time for the circuit of figure 4. 1(a). When the switch is closed, the voltage across the capacitor decays exponentially to zero. At one time constant, the voltage is equal to 36. 8 percent of its initial value. Charging a capacitor from a dc source through a resistor. Rc circuit: initially, uncharged capacitor c and resistor r (open circuit, no current)
