What you can do for eczema. 1  To cool your itch, soak a washcloth in ice-cold milk and lay the cloth onto the itchy area. 2  Keep your baths and showers under 10 minutes. 3  After you bathe, use a heavy cream-based moisturizer to guard the skin against irritants.  Stop the scratching.
How a PV cell makes electricity. Under the sun, a photovoltaic cell acts as a photosensitive diode that instantaneously converts light â but not heat â into electricity. A top, phosphorus-diffused silicon layer carries free electrons â un-anchored particles with negative charges.
How does hydroelectric power work? Water is needed to run a hydroelectric power-generating unit. The water is held behind a dam, forming an artificial lake, or reservoir. The force of the water being released from the reservoir through the dam spins the blades of a giant turbine. The turbine is connected to the generator that makes electricity as it spins. After passing through the turbine, the water flows back into the river on the other side of the dam.