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Technology Stocks : VALENCE TECHNOLOGY (VLNC)
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To: Peter Haynes who wrote (5358)11/19/1998 5:52:00 PM
From: Gordon Quickstad   of 27311
 
Some might confuse power density with energy density. An ultra-capacitor having 10 - 20 times the power density of a battery of equal size sounds awesome. However, power is measured instantaneously such as "horsepower" and a common unit is Watts. Energy is measured over time and a common unit is Watt-hours. You need power over a long period of time in order to provide useful work and that is why ultra-capacitors will supplement batteries and not replace them. (Such as provide the high current for a short time for acceleration in a vehicle, after which the ultra-capacitor recharges for the next stoplight or car to pass).
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