EEET2249 Tutorial 8 - EEET2249 Circuit Theory Tutorial-8...

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EEET2249 Tut-8 1 of 3 EEET2249 Circuit Theory Tutorial-8: Capacitors and Inductors Capacitance Q1: A voltage of 50V appears across a 10μF capacitor. Determine the magnitude of the net charge stored on each plate and the total net charge on both plates. (Ans: 500μC, net charge = 0) Q2: A 2000 μF capacitor initially charged to 100V, is discharged by a steady current of 100 μA. How long does it take to discharge the capacitor to 0V? (Ans: 2000s) Q3: The current through a 0.5 μF capacitor is shown in Fig. Q3. At t = 0, the voltage is zero. Sketch the voltage, power, and stored energy to scale versus time. Q4: Determine the capacitor voltage, power, and stored energy at t = 20ms in the circuit of Fig. Q4. (Ans: 4V, 8mW, 80μJ ) Q5: A constant (dc) current i(t) = 3 mA flows into a 50 μF capacitor. The voltage at t = 0 is v(0) = -20V. The references for v(t) and i(t) have the passive configuration. Find the power at t = 0 and state whether the power flow is into or out of the capacitor. Repeat for t = 1s. (Ans: p(0) = -60mW, p(1) = 120mW) i(t) (mA) t (ms) 2 3 5 20 -20 C = 0.5 μF i (t) v (t) Fig. Q3 2mA C t = 0 + v(t) - Fig. Q4
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