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저항과 동력

2016-08-20View Original

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저항 직경과 전력은 어떻게 보나요
Reply #22016-08-20
동일한 재질이라면, 직경이 클수록 저항이 작아집니다. 전기로의 전기로선을 살펴볼 수 있는데, 굵을수록 저항이 작고 출력이 큽니다.
Reply #32016-08-20
R=ρL/S (여기서 ρ는 재료의 밀도이며, L은 길이, S는 단면적입니다). 또한, S=π(D/2)²이고, W=U²/R입니다. 위의 관계식들을 통해 동력 W=U²πD²/4ρL이 됩니다. 따라서 D가 클수록 W도 커집니다

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