(20%) Problem 3: The duration of a photographic flash is related to an RC time c
ID: 1586376 • Letter: #
Question
(20%) Problem 3: The duration of a photographic flash is related to an RC time constant, which is 0.095 us during the flash discharge for a certain camera. Randomized Variables 0.095 us R 0.036 A 50% Part (a) If the resistance of the flash lamp is 0.036 2 during discharge, what is the size of the capacitor supplying its energy in uF? Grade Summary Deductions 0% 100% Potential Sin coso tan 0 7 8 9 Submissions Attempts remaining: 3 cotano asin acos0 A 4 5 6 05% per attempt) atan acotan Lsinho detailed view 1 2 3 cosh0 tanho cotanh0 BACKSPACE CLEAR Degrees O Radians Feedback Submit Hint I give up! Hints 32 deduction per hint. Hints remaining 2 Feedback 396 deduction per feedback. A 50% Part (b) What is the time constant for charging the capacitor, if the charging resistance is 800.0 kS in s?Explanation / Answer
here,
A)
time constant , t = 0.095 us
t = 0.095 * 10^-6 s
R = 0.036 ohm
t = R * C
0.095 * 10^-6 = 0.036 * C
C = 2.67 * 10^-6 F
C = 2.67 uF
the capacitance is 2.67 uF
B)
when R = 800 kohm
R = 800 * 10^3 ohm
C = 2.67 * 10^-6 F
time constant , t = R * C
t = 2.67 * 10^-6 * 800 * 10^3
t = 2.14 s
time constant for charging the capacitor is 2.14 s
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