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Soldering irons

A soldering iron is a hand tool used in soldering. It supplies heat to melt solder so that it can flow into the joint between two workpieces. For well over 4000 years mankind has known how to join metals together by soldering. In the 1800s and early 1900s soldering irons were still heated by flame.

Direct-Current Microgrids to Solve Power Woes

Innovative Direct-Current Microgrids to Solve India’s Power Woes – IEEE Spectrum article tells that a group at the Indian Institute of Technology (IIT) Madras in conjunction with industrial partners, relies on solar-powered direct-current (DC) microgrids. For homes not connected to the grid, a 125-watt microgrid can serve as the sole source of electricity. For connected