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【實驗指導】新版教科版小學科學四年級下冊2.2點亮小燈泡
1.由電池、電線、燈泡等組成的電流通路叫電路。
2.電從電池的正極流出來，通過導線從燈泡的一個連接點進入，經過燈絲，再從燈泡的另一個連接點流出，回到這個電池的負極，形成一條完整的電路，_???????°±???????????????è·??????????é????????????°±???????????????????°±???????????????_
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