kaled - 5:35 pm on Sep 16, 2008 (gmt 0)

Just a small correction... there's no such thing as "watts per hour" (not for the purposes of this discussion anyway).

1 watt == 1 joule of energy used/generated per second.
1 kilowatt (KW) == 1000 joules per second or 1 kilojoule (KJ) per second.
1 kilowatt-hour (KWH) = 3600 kilojoules.

By definition, power is the rate at which energy is converted from one form to another. The unit of power is the watt and the unit of energy is the joule. Capitals should only be used for the abbreviated forms (J, KJ, MJ, and W, KW, MW, etc.).

Hope that clears things up.

Kaled.