抵抗と電力
Thread Content
抵抗の直径と出力の見方
同じ材質で、直径が大きいほど抵抗は小さくなる。 電気炉のフィラメントを見てみると、太いものほど抵抗が小さく、出力が大きいです。
R=ρL/S（ρは材料の密度、Lは長さ、Sは断面積）、S=π（D/2）²、W=U²/R。これらの関係式から、出力W=U²πD²/4ρLとなる。したがって、Dが大きいほどWも大きくなる
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