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Author: cessna
Time: 12/01/03 15:31 PST
This is a reply to message no. 12606 by Booster
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Current Topic:
Home-made Giant batteries
DEAR BOOSTER:  FOR A TYPICAL LEAD ACID (AUTOMOTIVE) BATTERY LIKE YOU APPEAR TO BE DESCRIBING.  THE CELL VOLTAGE(REGARDLESS OF THE SIZE) IS ABOUT 1.25 TO 1.5 VOLTS.  THE SIZE OF THE CELL DETERMINES ITS CAPACITY IN AMP-HOURS.  TYPICALLY THE ELECTROLITIC SOLUTION IS CONCENTRATED SULPHURIC ACID.  THE PLATES ARE TYPICALLY LEAD AND LEAD OXIDE.  BATTERIES ARE CALLED "REVERESIBLE CELLS" BECAUSE THROUGH CHEMICAL ACTION THEY PRODUCE D.C. ELECTRICITY.  PUT D.C. ELECTRICITY BACK INTO THEM AND THE BATTERY CAN BE RECHARGED.  A BATTERY IS NOT STRICTLY AN ENERGY STORAGE DEVICE.  IT DOES NOT STORE ELECTRICITY, IT PRODUCES IT THROUGH A CHEMICAL REACTION.  A CAPACITOR IS AN ENERGY STORAGE DEVICE, THE DISCHARGE TIME USUALLLY VERY RAPID (MILLI-SECONDS).  THE TIME DEPENDS ON THE CAPACITOR AND RESISTANCE OF THE CIRCUIT.  WRAPPING A WIRE AROUND THE DRUM DOES MAKE A COIL, BUT IF IT IS ALSO A BATTERY THERE IS NO REASON TO DO THIS.

REGARDS
DAVE
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