Camera Capacitor Flash Physics Question?

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oscar1800

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An electronic flash attachment for a camera produces a flash by using the energy stored in a 890-F capacitor. Between flashes, the capacitor recharges through a resistor whose resistance is chosen so the capacitor recharges with a time constant of 2.3 s. Determine the value of the resistance.
 
R=T/C=2.3/890= 2.58 milliohms. Are you sure the capacitance is 890 farads, not 890 microfarads? 890F is a supercapacitor and 2.58 milliohms is a hell of a low resistance. If you meant 890 microfarads, the answer is 2580 ohms, which is more realistic.
 
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