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today in D&T (Deign & Techonooly) and where making a power generator so its like a metal pole on this handle connect to this machine and where you touch stuff with the poll it make it work like theres a another wire with a clip on it for the negative (or ground) so we learnt all this stuff today (by the way this is a combined project with metal works (to make a box to hold it) anyways like and you control the voltage control and i think you can by stuff like that from handy shops or hardware for $50 witch might be good coz u can control the voltage on mine