The duration of a photographic flash is related to an RC time constant, which is 0.190 µs for a certain camera. (a)
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- 4. You can easily find the time constant if you are given a graph of voltage across a discharging capacitor as a function of time. When t = Tc = RC, the voltage across the capacitor is AV (t = Tc) = AV, e¹≈ 0.37 AV Therefore the time constant is just how long it takes for AV (t) to reach 37% of its initial value. The graph shows the voltage across a discharging 0.2 μF capacitor as a function of time. Use the following steps to determine the resistance. a. What is 37% of the initial voltage? 21 b. How long does it take (after discharge starts) for the voltage to reach 37% of the initial voltage? This time is equal to the time constant. c. Use your time constant from (b) to determine the resistance. AV (Volts) 2 1.5 0.5 %40 80 120 160 time (milli-sec)-/1 Points] DETAILS SERCP10 18.P.035. A charged capacitor is connected to a resistor and a switch as in the figure below. The circuit has a time constant of 2.50 s. Soon after the switch is closed, the charge on the capacitor is 81.0% of its initial charge. +Q www R (a) Find the time interval required for the capacitor to reach this charge. S (b) If R= 200 kn, what is the value of C? UFAn RC circuit has an unknown resistance and an initially uncharged capacitor of 515 x 10^-6 F. When connected to a source potential, it takes the capacitor 25.5 s to become 90% fully charged. What is the resistance of the circuit? Enter a number rounded to the nearest 100 place.
- A fully charged capacitor with capacitance of C= 80 uF is being discharged. If the total electric resistance of the circuit is 24.0 k and the initial voltage of capacitor is V=10 V, then: a) How long does it take for the capacitor to discharge by 70%? b) Calculate the energy lost from the capacitor by this time? c) Calculate the heat energy produced in the resistor by this time. d) Are the values of energies in parts c and d expected to be the same? Explain.b. About how many time constants does it take to charge a capacitor in an RC circuit to 50% of its maximum value?The duration of a photographic flash is related to an RC time constant, which is 0.12 us during the flash discharge for a certain camera. td = 0.12 us R = 0.048 ohm (a) If the resistance of the flash lamp is 0.048 ohm during discharge, what is the size of the capacitor supplying its energy in uF? (b) What is the time constant for charging the capacitor, if the charging resistance is 800.0 kOhm in s?