The RC charging circuit in a camera flash unit has a voltage source of 295 V and a capacitance of 126 µF. HINT Apply the expression q = Q(1 – e-t/RC). Click the hint button again to remove this hint. (a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 14.2 s. (b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.14 ms.

The RC charging circuit in a camera flash unit has a voltage source of 295 V and a capacitance of 126 µF. HINT Apply the expression q = Q(1 – e-t/RC). Click the hint button again to remove this hint. (a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 14.2 s. (b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.14 ms.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter29: Direct Current (dc) Circuits

Section: Chapter Questions

Problem 19PQ

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Question

The RC charging circuit in a camera flash unit has a voltage source of 295 V and a capacitance of 126 µF.
HINT
Apply the expression q = Q(1 - e-t/RC).
Click the hint button again to remove this hint.
(a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 14.2 s.
(b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.14 ms.
A

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