When the Effectiveness Module is attached properly to a 20px Refinery it will help the Refinery produce more ingots per ore. Which means more ingots will be produced from less amount of ore. The Module has to be connected to two module port squares from the Refinery it sits on to work appropriately, and be powered. Its dimensions are 1x1x2 (Height x Width x Depth). It is arguable the most practical module of the three modules due to the fact that four Effectiveness Modules can increase a full-sized refineries' ingot output up to a maximum of 200%. This means 10 kilogram of Iron ore becomes 20 kilograms of Iron Ingots; which scientifically does not make sense; given that Matter can not be created nor destroyed, it can however transform. However, on maps where resources are uncommon; this module has proven a much greater asset given that all ores inserted are effectively doubled. In turn this means that the same amount of mining results yields double the rewards; assuming there are four Effectiveness modules on the same refinery.
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