For testing of network Appliances, batteries, and similar are necessary to make a consumer with a defined load characteristics. This task accepts a so-called current sink. It offers very high precision regulated load at high power. Here are some links to current sinks schematics

Here you will find Schematic Circuit Diagram for DIY and further information on Current sink
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High load current sink with pcb layout	www.doktor-baumgartner.com/modell/stromsenke/stromsenke.htm
Current sink for battery discharge	www.fg-gag.de/michael/senke.gif