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for light and cooking. start-up gravitylight set out to tackle this by developing an affordable and safe light that can be powered with just a bag of rocks. watch: how can a bag of rocks spark a kenyan child's imagination?...
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diodes can also be used to generate light, as in light-emitting diodes and laser diodes . transistor[ edit ] further information: transistor bipolar junction transistor (bjt)[ edit ] an n–p–n bipolar junction transistor structure bipolar junction transistors (bjts) are formed from two p–n junctions,...