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Q. A series connection is a type of electric circuit in which there are multiple paths. Q. A resistor is a device that controls current in electric circuits. Q. An electric current is a flow of charged particles. Q. Compared to thin wires electrical resistance in thick wires is Q. When one bulb in a series circuit containing several light
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Jun 23 2015 A study out of the Harare Institute of Technology also listed that printed circuit boards contain about 20 wt copper 0.04 wt gold 0.15 wt silver and 0.01 wt palladium with wt representing percentage by weight.A chart in the study from the Proceedings of the International Conference on Sustainable Solid Waste Management also listed the presence of
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Mar 31 2022 the main board amongst others CPU RAM and graphic chip and other PCBs directly forwarded to the copper smelter mass storage systems e.g. hard disc drives HDD or solid state drives SSD and optical disc drives to be forwarded to a medium shredder for further separation of iron aluminium magnets and circuit board fractions.
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Dec 30 2021 Copper is a valuable metal with many uses. Because of its high demand and versatility many things that used to be made of solid copper are now being made of other materials and simply plated or covered with copper on the outside. This copper plating can be removed by dissolving the copper with specific chemicals or by grinding it off.
Oct 30 2008 Korean researchers investigated recovery of nickel copper tin and lead from waste multi layer ceramic capacitors MLCC or spent nitric etching solutions of printed circuit board . It was resulted that the leaching rate of nickel from MLCC in HNO 3 solution was found to be much higher than that obtained with HCl and H 2 SO 4 solutions.
Aluminum wire conductivity is approximately 61 that of copper so the resistance of aluminum wire is nearly the same as that of a copper wire 2 AWG sizes smaller about 63 of the area size of aluminum . To assess their performance in a circuit Powertech Labs of Surrey British Columbia Canada tested
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Printed circuit boards PCBs which are laminated with copper and many other precious metals Au Ag Pd and Pt along with hazardous elements such as flame retardants and glass reinforced epoxy
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Koyama 36 37 38 39 40 also conducted a research on recycling of copper from waste printing printed circuit board. They used Ammonia ammonium salt system containing Cu I
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