Working project \u201cBimetal-Fan\u201d Simple construction-it can be made in a normal classroom with everyday tools! Uses bimetal as a switch to close an electric circuit When the circuit is made the fan cools the bi-metal and then it switches itself off. A candle re-warms the bi-metal and it starts again Less battery, 1 each<\/p>\n","protected":false},"excerpt":{"rendered":"
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