A Misconception of Electric Circuitry in Junior High School Students and Undergraduates

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  • 中学生と大学生における誤った回路認識
  • チュウガクセイ ト ダイガクセイ ニ オケル アヤマッタ カイロ ニンシキ

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Abstract

It is quite natural that a household electric appliance such as a television works in a electric circuit. But the author encountered several undergraduates who had the notion that an electric current was sent out one-sidedly from a power plant to a television and was consumed in it. This study investigated to what extent such a misconception was held by undergraduates and junior high school students. Subjects were presented several different figures illustrating schematically how an electric current flowed between a power plant and a television in a house, and then they were asked to select a correct one. About 55% of the undergraduates and 30% of the junior high school students selected a figure in which an electric current was illustrated as being sent out one-sidedly from a power plant to a television. Ss were then asked whether or not a man would be struck by electricity when he jumped and touched a transmission line that was torn off and dangling. Many subjects answered he would be struck. These results indicated that they pay no respect whether a load was incorporated into a circuit or not.

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