What is the maximum height to which any liquid can rise due to capillary action?
Power of the sun, sea and sand By Paul Singh Until now, generating electricity from solar energy has been a costly affair and it remained largely untapped. Any new energy technology must be economically more attractive than the existing sources. The high hidden environmental cost of existing fossil and nuclear energy sources has compelled scientists to find some alternatives like wind, geothermal, solar etc. The cost of these sources should match with the cheapest (US$0.04 per KWH) and most widely used fossil fuel i.e. coal. Electricity from solar energy seems to have better long-term prospects. Already existing solar energy technologies such as thin film photo-voltaics (PV) technology from Interphases and very high efficiency concentrated photo-voltaics from Spectrolab and Emcore will probably take seven to 10 years to reach the cost target. The water based PV concentrator termed as Liquid Solar Array (LSA) system developed has all characteristics to meet the required cost target reli
