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第二種電気工事士 筆記試験
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図のように、20Ωの抵抗と30Ωの抵抗が直列に接続された回路があります。この回路に100Vの電圧を加えたとき、回路全体を流れる電流 I [A] はいくらですか。
10
5
2
1.5
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2
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