How to prepare green energy science working model?
Your question is a bit vague. Maybe something which uses a small photovoltaic (PV) panel? You could use the PV panel to drive a small electric motor (very low-power "solar" motors are available) which you could mount in a working model windmill, or a model helicopter? You can also buy these things as kitsets in educational/hobby shops.
Teaching Green Construction using LJ Create's eLearning Resources (US)
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