current flow from the base to the positive electrode switches the corresponding transistor on, and the LED in turn. Thus, you have a useful liquid level indicator with seven distinct output levels.

Silas takes a look at the £90 Liquid cooler from Rajintek - the ORCUS 240 which features a liquid flow indicator and the ...

A team of researchers from Boston College has created a new metallic specimen where the motion of electrons flows in the same way water flows in a pipe—fundamentally changing from particle-like to ...