The RC charging circuit in a camera flash unit has a voltagesource of 275 V and a capacitance of 125 µF. (a) Findits resistance R if the capacitor charges to 90.0% of its finalvalue in 15.0 s. (b) Find the average current delivered to theflash bulb if the capacitor discharges 90.0% of its full chargein 1.00 ms.

University Physics Volume 2
18th Edition
ISBN:9781938168161
Author:OpenStax
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Chapter10: Direct-current Circuits
Section: Chapter Questions
Problem 10.6CYU: Check Your Understanding In considering the following schematic and the power supplied and consumed...
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The RC charging circuit in a camera flash unit has a voltage
source of 275 V and a capacitance of 125 µF. (a) Find
its resistance R if the capacitor charges to 90.0% of its final
value in 15.0 s. (b) Find the average current delivered to the
flash bulb if the capacitor discharges 90.0% of its full charge
in 1.00 ms.

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