P 7.4-8 The circuit shown in Figure P 7.4-8 is at steady state before the switch opens at time

t = 0.

The voltage v(t) is given by

(a) Determine the energy stored by each capacitor before the switch opens.

(b) Determine the energy stored by each capacitor 1 s after the switch opens.

The parallel capacitors can be replaced by an equivalent capacitor.

(c) Determine the energy stored by the equivalent capacitor before the switch opens.

(d) Determine the energy stored by the equivalent capacitor 1 s after the switch opens.

Figure P7.4-8

The two capacitors are in series so they both have the same voltage profile given by v(t).

(a) Determine the energy stored by each capacitor before the switch opens.

Since switch opens at t = 0,and energy stored is given by

(b) Determine the energy stored by each capacitor 1 s after the switch opens.

Since switch opens at t = 0,and energy stored is still given by

The parallel capacitors can be replaced by an equivalent capacitor.

(c) Determine the energy stored by the equivalent capacitor before the switch opens.

Since switch opens at t = 0,and energy stored is given by

(d) Determine the energy stored by the equivalent capacitor 1 s after the switch opens.

Since switch opens at t = 0,and energy stored is still given by

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This page last updated on April 12, 2019