The rating plate or handbook for each item of your equipment should give you a figure for maximum power consumption in watts. Take this figure and divide it by 1000 and this will give you the KilowattHour consumption for that item. Multiply it by the time (in whole hours or fraction of) each item of equipment is switched on for and this will give you the total consumption. Depending upon what unit of measurement your electric utility bills you in you can work out the cost of your electricity for each item. For example, if your utility bills you in "units" (where 1 unit equals 1,000 watts used in 1 hour) then say an amplifier that consumes at full rating 400 watts and is operated for 3 hours would use 400 x 3 = 1.2 KwH or 1.2 "units" of electricity. Another example: if an amp uses 1200 watts then in one hour it would use 1.2 KwH or 1.2 "units". In BTU's 1KwH (or 1 unit) equals 3,410 BTU's. Hope none of this has confused you even more...? Hope it helps, regards, Richard
