If a bunch of geniuses from City University of Hong Kong have their way, they are all set to make the rain droplets a new source of energy. Yes, they can that just a drop of rain released from just 15 cms would be enough for them to engineer a way out to generate electricity that can power almost 100 small LED bulbs for a short while.
The engineers claim to have generated this power using the kinetic energy, which is generated from gravity . When this kinetic energy is met with few minerals of rain droplets, it causes a friction and causes electricity as a result. They have been able to ascertain that the energy can be generated but for how long, is yet to be determined.
Items such as Umbrellas and water bottles that get wet a lot in rain are listed as potential source of energy.
Here is what Daily Mail says about this:
The researchers’ new energy harvesting design overcomes these limitations in two different ways.
First, the team used a material called polytetrafluoroethylene (or PTFE) which has a quasi-permanent electric charge.
They found that when drops hit PTFE, the charges on its surface gradually build up until they reach a saturation point — allowing them to overcome the bottleneck presented by previous approaches that could only build up small charges
Here is a small video of it:
Researchers at the University of California have theorized that if the way the solar panel works is reversed to exact opposite then the solar panels can provide electricity at night also. They have named it anti-solar panels. Normally solar panels work by capturing sunlight and then it releases energy but the anti-solar panels would work by releasing energy from earth to space. If the theory is expected to be believed then anti-solar would generate a quarter of energy of what it would generally generate in sunlight.
Here is what the researchers have to say:
“In order to produce electrical power after the sun has set, we consider an alternative photovoltaic concept that uses the earth as a heat source and the night sky as a heat sink, resulting in a ‘nighttime photovoltaic cell’ that employs thermo-radiative photovoltaics and concepts from the advancing field of radiative cooling,” researchers explain in the study published.
Here is a small video that would help you understand: