저항을 줄이면 전류는 몇배가 되는가? | 문제풀이

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옴의 법칙을 활용한 저항감소시 영향 문제

V=IR에서 R(저항)을 줄이면?

문제)

어떤 저항(R)에 전압(V)를 가하니 전류(I)가 흘렀다. 이 회로의 저항(R)을 20%줄이면 전류(I)는 처음의 몇 배가 되는가?
① 0.8
② 0.88
③ 1.25
④ 2.04

1분 문제 풀이

해당문제는 어찌보면 쉬울것 같지만 함정이 존재!!!

20%라는 문제의 조건은 20을 줄여라로 착각하고 반대로 문제를 풀수도 있다.

그러나 모든 시험의 내용에서 %를 변형해야한다.

20%는 20/100 <- 100분의 20 으로 변형해야한다.

그렇다면 이것은 위의 영상에서 처럼 I=V/R 에 20/100 으로 대입을 할 수 있고 이것이 답으로 이어진다.

문제의 답과 풀이는 위의 영상에서 1분풀이를 하고 있다.

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