POWER CONVERSION CALCULATOR Here are some of the ways that you will see energy represented: Modify the value in any box and see what happens. Energy Time Power Joules  Seconds Minutes Hours Days Months Years Watts  This is the average power in full sunlight falling on a square foot surface, directed toward the sun, and collecting hours each day.  Watt Hours  Kilowatts  Kilowatt Hours  Horsepower  BTU  BTU/hr  Therms  tons  The following table illustrates how various energy storage systems would store this amount of energy:  Chemical gallons of gasoline ( pounds)  pounds of natural gas ( cubic feet at psi),  pounds of hydrogen Gas ( cubic feet at psi),  a lead-acid battery weighing pounds  Mechanical (Kinetic) a high-tech flywheel weighing about pounds  a pound car traveling at miles per hour  Thermal melting a block of ice weighing pounds  heating a gallon tank of water by degrees F.  evaporating pounds (about gallons) of water  heating a pound hunk of concrete by degrees.

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