Five to ten minutes on the seesaw will generate enough energy to power a classroom for an evening? Oh really?
A strong amateur cyclist riding hard on a bike - which is quite an efficient mechanism for delivering power - can make maybe 250W. So how's a child bouncing on a seesaw going to generate an evening's worth of even _one_ lightbulb?
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A strong amateur cyclist riding hard on a bike - which is quite an efficient mechanism for delivering power - can make maybe 250W. So how's a child bouncing on a seesaw going to generate an evening's worth of even _one_ lightbulb?