I am not a (real) engineer, but have undertaken an ambitious project which contains some technical intricacies I have to learn on the fly. My first question (of many to come no doubt) is about strain gauge load cell technology - specifically powering the device. My project requires a battery powered weighing system, load range 0 to 500lbs, split between two contact points with required accuracy of .2% (1lb). I need to calculate the power draw of prospective load cell types so that I can select the best battery (cost vs. capacity) for my application. Question 1: is the load cell's output resistance figure the best proxy for total device resistance? Question 2: if yes to above, do I derive total Amp usage by dividing excitation voltage by output resistance? Question 3: Is the listed excitation voltage an absolute requirement or can I power the device with a lower voltage battery? (ex if specs. state 15v, can I power with a 5v or 10v, perhaps this is dependent on the MV/V rating?) Here is one particular cell I am considering: http://www.flintec.com/type_pb_planar_beam_load_cell.html Hope EE is the right place for this question, if not please advise. Thanks in advance!