The switch in the circuit of Fig. 8.91, often called a make-before-break switch

Question

The switch in the circuit of Fig. 8.91, often called a make-before-break switch (since during switching it briefly makes contact to both parts of the circuit to ensure a smooth electrical transition), moves to position b at t = 0 only after being in position a long enough to ensure all initial transients arising from turning on the sources have long since decayed. (a) Determine the power dissipated by the 5 Ohm resistor at t = 0-. (b) Determine the power dissipated in the 3 Ohm resistor at t = 2 ms. FIGURE 8.91 Referring to the circuit represented in Fig. 8.92, (a) obtain an equation which describes v C valid for all values of t; (b) determine the energy remaining in the capacitor at t = 0+, t = 25 micro s, and t= 150 micro s.

Explanation / Answer

power dissapated by 5k ohms will be zero becoz the circuit will open due to fully charged capacitor....no current flows means no power disspated.....

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