Vaginal dryness and vaginal atrophy facts. Vaginal atrophy is the medical term that refers to the thinning of the wall of the vagina that occurs during the menopause (the time after menstrual periods have ceased) in women.
In series combination, the potential across any capacitor is inversly proportional to its capacity If the voltage across the first capacitor (the one with capacitance C) is V', then V'=Q /C The voltage across second capacitor =Q/2C =(1/2)Q/C=V'/2 The voltage across third capacitor =Q/3C =(1/3)Q/C=V'/3
That leaves us with 236 J to light the LED. Now we need to see how much power the LED needs. Let's go back to your original white LED and pick some numbers. Let's say it needs 3.5 V at 20 mA to shine nicely. That's 3.5V * 20 mA = 70 mW. (236 J)/(70 mW) = 3370 seconds, or 56 minutes.sing the first approximation of the LED having constant voltage accross it, that means the capacitor voltage is 2 V. The question is now how long does it take to decay from 2.7 V to 2.0 V at a 2 hour time constant. That is .3 time constants, or 2100 seconds, or 35 minutes.