Question

1. A 577 μF capacitor is discharged through a resistor, whereby its potential difference decreases from its initial value of 81.7 V to 24.1 V in 4.15 s.Find the resistance of the resistor in kilohms.

2. A capacitor of 10.0 μF and a resistor of 120 Ω are quickly connected in series to a battery of 5.00 V. What is the charge Q on the capacitor 0.00200 s after the connection is made?

3. A heart pacemaker fires exactly 6565 times a minute. Each time it fires, a 35.0 nFF capacitor is charged by a battery in series with a resistor to 0.732 of its full voltage. What is the value of the resistance R? (ohms)

Answer 1

1. Capacitance , c = 577 ut c =577710-6F inisial voltage across capacitan Vi = 81.7V at to = 4.158 V = 24.10 In discharging capacidor Voltage across capacitor V = Viertke at tato = 4.15see V = Vs » Vf a vi e tolke 7 Vf en tolke In - tolke

to R = - chl If - 4.15 5774186h ( 24.1) = 5.884103 - 5.89 kr