Doable Renewables. 16 Alternative Energy Projects for Young by Mike Rigsby

By Mike Rigsby

Humankind must locate and boost replacement varieties of power. because the world’s inhabitants maintains to develop, extra humans will desire entry to lighting fixtures, verbal exchange, transit, and computing. Fossil fuels are getting used up at an alarming velocity, yet different strength sources--solar, wind, waves, “waste” warmth, or even human power--are either renewable and environmentally pleasant. The initiatives during this booklet might help any budding scientist build and discover operating types that generate renewable, replacement energy.

            In Doable Renewables, readers will easy methods to construct a Kelvin water drop generator out of six recycled cans and alligator clip jumpers, a solar-powered seesaw from a wide dial thermometer and a magnifying glass, and a windmill from 8 yardsticks, PVC pipe, cardboard, and converter generator. little ones will examine the energy-generating houses of a sunlight mobile, a radiometer, a Nitinol warmth engine, and a Peltier mobile. They’ll even construct a human-powered table lamp.

            each one venture encompasses a fabrics and instruments checklist, in addition to on-line info on the place to discover really expert elements. And for younger scientists, writer Mike Rigsby demonstrates tips to use an infrared thermometer, a electronic multimeter, and an electric utilization computer screen to check their designs. Armed with this choice of technological chances, can the answer to the earth’s strength situation be some distance off?

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Com, Model # 90309) Aluminum rod, 1⁄16 inch diameter, 8 inches long Magnet wire (#26), or similar wire Drill, 5⁄64 bit Aluminum foil Wood blocks or books Dark sunglasses Magnifying hand lens 39 01(001-076)_chap01-11:DoableRenew 40 7/22/10 5:22 PM Page 40 Doable Renewables Build It First, take a CD and cut it in half with scissors. Next cut two Beams (6A) out of cardboard. Epoxy glue the CD to one of the beams. It should be centered with the hole of the CD lining up with the hole in the beam. 01(001-076)_chap01-11:DoableRenew 7/22/10 5:22 PM Page 41 Solar Seesaw 41 Epoxy the other beam to the first beam, with the CD between them and the holes aligned, and insert a pencil (axle) through the center hole.

When you place the bird’s beak into the water, its fuzzy head gets wet. Water on the wet head evaporates (unless the humidity is very high) as it bobs back and forth, cooling the head. The head, being cooler than the body, causes the liquid inside—a special liquid that boils at a low temperature—to rise up the neck, higher into the bird. The rising liquid causes the bird to become top-heavy and tip forward. When it tips forward, the head falls back into the glass and gets more water, while the liquid inside is allowed to return to the body.

01(001-076)_chap01-11:DoableRenew 7/22/10 5:21 PM Page 34 01(001-076)_chap01-11:DoableRenew 7/22/10 5:21 PM Page 35 5 Stirling Engine I n 1816 the Reverend Dr. Robert Stirling invented a heat engine now known as the Stirling engine. Stirling was concerned by some of the dangerous steam engines of his time—they sometimes exploded and killed nearby workers. He designed a more efficient engine that saved some of the heat from one cycle and used it in the next. ” A Stirling engine can reach about 50 percent of the maximum possible efficiency (as defined by Carnot), making it one of the most efficient engines that can be constructed.

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