BOUNDARIES AND LIMITS FOR REGULATIONS

POWER LIMITED CLASSES

DC Class II 60 V 100 W 8 A

DC Class II 60 V 100 W 5 A 250 W 1 kW

DC Class III 100 V 150 W 250 W 1 kW

AC Class II nameplate 30 V 8 A

AC Class II current 30 V 5 A

AC Class III power 100 V 150 W 250 W

intrinsic 1.3 W simple 25 mW

The threshold of hearing is defined as 0 db = 10^-16 watts / square centimeter.

Batteries: 12 V automobile, two No.6 ignition, AA cell; the discharging and charging curves for the 12 V battery are shown; it is assumed that the internal resistance of the charger is the same as the internal resistance of the battery; higher charging voltages cause the current curve to approach the characteristic impedance asymoptotically. The efficiencies of the charging and discharging are shown as straight lines on the log-log plot with 100% positioned at 1 A on the current scale. This illustrates the higher efficiencies achieved with larger batteries and lower currents; the influence of the increasing price of energy and the limits of solar and wind generation are thus evident.

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15 standard colors for maps http://en.wikipedia.org/wiki/Wikipedia:WikiProject_Maps#Map_colors

The solar constant is 1366 W/sqm; for the whole earth it is 1.740∙10¹⁷ W. One horsepower is 746 watts. Compressed air at 1 cubic ft per minute at 100 lb per square inch is equivalent to 24/55= 0.43636 horsepower or 325.4 Watts. 100,000 BTU/hr or 1 therm/hr is 29.30 kW and 1 ton of ice melting in one day is 3.516 kW.