how to record initial battery voltage if i have "AAA size battery 1.5 volts?
467003
You'll need, as the name may suggest, a voltmeter.  Also applicable is a multimeter - which you'd then set to voltmeter mode.\n\nAt which point you'd just put one contact on one one end of the battery, and one on the other, and see what the equipment reads.\n\nMy money's on 1.5V :)
55953
Make a battery from a lemon!\n\nhttp://www.energyquest.ca.gov/projects/lemon.html
261277
It's simple do this job. First of all you need to set your volt meter to a specific voltage level. Like if you want to check voltage of batteries, it ranges between 1.5 to 14 volts. So set your volt meter dail to DC (Direct Current) with this voltage specification.\nFor checking voltage in your house, its a 110-120 V or 220-240 V. This depends on your location. So now you have to set the dail to AC (Alternating current. THe symbol of AC is " ~ ".\n\nI', also a site here. It would solve the job definitly.\n\n\nhttp://www.ehow.com/how_16767_voltmeter.html
824800
You can use an integrated circuit, like LTC6906 from Linear Technology which goes up to 1MHz at 2.25 - 5VDC supply,\nsee:  http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1010,C1096,P9790,D6998\nAlternative: MAX5094A by Maxim,  see:  http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5017\nI didn't have the time to check the output power, but if it's not enough, a simple emitter stage transistor will do.
701647
An idea would be to use a relay circuit to control the operation of the charger. The voltage out of the battery could be divided so as to latch a "normally off" relay to keep the charger off. The resistance of this circuit would be such that it would not excessively drain the battery. Once the relay is unlatched, the charger would come on.\n\nNow the difficult part - the voltage applied to "charge" the battery would have to be in excess of the "high" voltage in your range. A suggestion would be to use a timer to then cycle off the relay.\n\nThere are commercially available products that already perform this function, if I am not mistaken.
676845
Volts Per Cell.  I've no idea how many cells your battery comprises, but it's a guidleine to avoid overcharging.
177692
No matter what is the voltage rating, isolation or insulation is tested by using "MEGGER".\nThe value should be atleast above 1 Mega ohm in any case
175787
you must use some one plug to fill your battery. but make sure your battery can bear the  power of plug.\n\nhahahahahahahahahahaha
1177496
If you have a voltage regulator that is poorly designed (or adjusted?) it will overshoot the target voltage then correct and overshoot in the other direction, etc. etc.  Usually there must be some type of feedback in the circuit that accepts small deviations rather than "hunt" for a too precise voltage value.  Hope that helps a little.
81594
Use ohm's law (I=E/R); 2 AAs are 2.4 to ~3 volts depending on battery type, so 0.4 to 0.5 A.\nHOWEVER, if you measured the bulb's resistance cold, it will be higher when hot, so it will draw less current.
186229
Here are some sites that may help.  Both have circuit examples utilizing LVDT's.  Hope this helps.
871859
Nominal voltage required for excitation of a circuit.\n\n- - - - - - -s-
71357
Volts-drop test.\n\nPut the armature on a V-block powered by a regulated voltage source.  Check the voltage across 2 adjacent com segments and repeat as you rotate thru 360 degrees.  They should all be the same.
440855
Could be a real bit*h building a capacitor to store only 20 volts and produce 100 watts for 15 minutes. That's 5 Amps for 5 minutes! How are you going to charge it? A capacitor is not the ideal way to provide power to run something for any appreciable length of time. What's wrong with a battery? Take two car batteries, tie them in series. It will be about 25 volts but could run your 100 watt load for a very long time.
676452
If you use the same bulb for all these different voltages, it will either burn out really fast on 12V or not light at all on 1.5V, or do both. You didn't say what the 12V battery is; suppose it's a car storage battery, then it'll shine brightest and last longest if you use the right bulb, which would be 12V (to not burn out) and something like a brake-light bulb (3 amps or so, which will last at least 20 hours on one charge and put out 36 watts). You can't beat that combination (brightness times duration) with any other of the batteries you listed.
288081
http://www.camcorder-battery-bank.com
354041
There are several converters. Try this, for example...