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JerseyGirl
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Cutnell Physics 7th Ed pg 600 # 39
A camera flash has a capacitor.
Capacitor has a rating of: 850uF
The potential difference between the places is: 280V
a) Determine Energy used to produce flash.
b)If flash lasts 3.9E-9 S, what is the power or wattage of the flash?
V=C/F
W=VA
A=C/S
a) (280V)(850uF)= 0.238C
b) (0.238 C)/(3.9E-3 S)= 61.03A
W=?
The back of the book has a) =33J b) 8500W
Where did I go wrong?
Thanks in advance.
Homework Statement
A camera flash has a capacitor.
Capacitor has a rating of: 850uF
The potential difference between the places is: 280V
a) Determine Energy used to produce flash.
b)If flash lasts 3.9E-9 S, what is the power or wattage of the flash?
Homework Equations
V=C/F
W=VA
A=C/S
The Attempt at a Solution
a) (280V)(850uF)= 0.238C
b) (0.238 C)/(3.9E-3 S)= 61.03A
W=?
The back of the book has a) =33J b) 8500W
Where did I go wrong?
Thanks in advance.