rl_rc_problem4 - Sample problems Topic: RC and RL circuits...

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Sample problems Topic: RC and RL circuits Statement of problem The switch in the circuit has been in position 1 for a long time before moving to position 2 at t=0. 0 i 25 nF − + 4 0 21 0 i × 0 t = 60 Ω 2 1 3.3 k Ω 25 V Find 0 () it for 0 t + . Solution When t<0, the circuit is in steady state 25 nF − + 4 0 0 i × 3.3 k Ω 25 V 0 0 (0) 25 C i vV = = When t>0, the circuit seen from the capacitor can be modeled as its Thevenin equivalence. 0 i − + 4 0 0 i × 60 Ω T v + The Thevenin equivalent internal resistance is 4 00 0 6 0 19.94 T T ii v R k ×−
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rl_rc_problem4 - Sample problems Topic: RC and RL circuits...

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