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calculating energy delivered - comparing machines

Posted by Scott R on 2/21/04 at 11:20 (144920)

Put a thermometer in a glass of room-temperature water in an insulted cup and zap from the top. If 500 shocks raises 100 ml of water 5 degrees C, then Joules delivered = 4.184 x 100 x 5 / 500= 4.184 Joules per shock. The only significant error in this is if there is evaporation, in which case the energy delivered will be under-calculated. The experiment should be done quickly compared to the time it takes the cup to lose heat energy and return to room temperature. In any event, any error in the simplicity of this method will underestimate the enery delivered.