1. What is Vc 2.what is the energy dissipated in the resistor after t=0 2. [2pt]

Question

1. What is Vc 2.what is the energy dissipated in the resistor after t=0 2. [2pt] What is Ve at time t-2.0 milliseconds? DATA: R-415 ohm, C-4.0 uF Vb-2.55 V. Answer: Not yet correct, tries 1/20 Submit All Answers Last Answer: 0 V 3. [2pt] What is the energy dissipated in the resistor after time t-0? Answer: Submit All Answers 4. [2pt] Using the same data as above, consider the case when the switch is in position b for a long time, then switched to position a at time t-O. What is Ve at time r-2.0 milliseconds?

Explanation / Answer

2.

We know that voltage as a function of time is

V=Vb(1-e-t/RC)

So at t=2*10-3 seconds,

V=2.55 (1-e-2/1.66)

V=1.785 V

3.

At t=0 the capacitor behaves as a closed switch so,

P=Vb2/R
P=2.552/415

P=0.01566 W

4.

Now when the capacitor is discharging, voltage as a function of time is,

V=Vb(e-t/RC)

=2.55(e-2/1.66)

V=0.76435

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