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@takeru0x5569(takeRu)

抵抗早見表：消費電力，ディレーティング

Posted at

電圧と抵抗値が決まった際に，実際に使用する抵抗部品の定格グレードをいくつにするか確認 しますよね．　
かれこれ２０年近く，毎度電卓を叩いて確認していましたが，電卓を叩く元気も暗算力も衰えてきたので自分で見る用に早見表をつくりました．

条件

抵抗の消費電力は毎度おなじみオームの法則より
image.png

定格グレード/ディレーティング

抵抗の定格グレードはチップ抵抗のメジャーどこで色分けします．
ディレーティング５０％ってことで，部品の定格の半分を超えないように早見表を作成します．
image.png

抵抗電力早見表

image.png

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