Please show all steps on an attached picture In the circuit below, the capacitor

Question

Please show all steps on an attached picture

In the circuit below, the capacitor is initially uncharged when Switch A is closed for 1.5 s, then opened. Switch B is then closed, allowing the capacitor to uiscridrge into me resistor (R = 40 ). What is the instantaneous power dissipated in the resistor after the switch has been closed for 1.09 s? (Hint: the capacitor is not fully charged to the same voltage as the battery.) Write your answer to three significant figures. You will report your units in Question 2.

Explanation / Answer

Vc = 12*(1-exp(-t/Rc)) = 12*(1-exp(-1.5/(40*50*10^-3))) = 6.332 volts

Vr = Vc*(exp(-t/Rc) = 6.332 *(exp(-1.09/(40*50*10^-3))) = 3.67 V

Power = V^2 / R = 3.67^2 / 40 = 0.337 W

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