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【實驗指導】新版教科版小學科學四年級下冊2.4電路出故障了
1.電路出故障了，我們
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"https:?/??/?mp.weixin.?/?_blank?)可以用電路檢測器來檢測哪里出了問題。我們也可以用替換法來排除故障，使燈泡亮起來。
2.像銅絲那樣可以通過電流的物質，叫導體。銅、鋁、鐵等各種金屬、鉛筆芯、人體、大地等都是導體，利用導體可以把電送到人們需要的地方。
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做一個電路檢測器的方法：把簡易電路中的開關拆除后，就形成了一個電路檢測器。
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做一個電路檢測器的步驟：
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提示：每次檢測前，先將兩個檢測頭互相接觸一下，看看小燈泡能否亮起來。
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強調：不能用電路檢測器檢測家用電器的電路。
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5.電路中的哪一部分出了故障，你是怎么知道的？又是怎么排除的？
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可能出現的故障
檢測部位
排除故障的方法
小燈泡壞了
檢測小燈泡
更換小燈泡
小燈泡與燈座接觸不良
檢測小燈泡與燈座的接觸之處
將小燈泡重新固定在燈座上，并且使之接觸良好。
電池沒有電了
檢測電池
更換電池
導線斷了
檢測導線
更換導線
開關接觸不良
檢測開關
更換開關
精煉反饋
1.電路檢測器連接到沒故障的地方，小燈泡就會亮；連接到有故障的地方，小燈泡就不會亮。
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A.對
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B.錯
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C.不知道
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【答案】A
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2.我們制作的電路檢測器可以去檢測家用220V的電器電路。
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A.對
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B.錯
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C.不知道
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【答案】B
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