# 27 - 27 27-1,2,3 1(solar wind(cosmic rays 2 1 2 4(1 i= 5(1...

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27장. 전류와 저항 27-1,2,3 전하이동, 전류, 전류밀도 1. 전하이동의 보기 벼락, 신경전류, 각종 전기제품에 흐르는 전류, 태양풍(solar wind), 우주(방사)선(cosmic rays) 2. 전하이동과 전류 사이의 관계 전하의 이동이 곧 전류는 아님; 전류는 알속전하의 이동을 뜻함. 전하는 이동하지만 전류가 없는 경우의 보기: 1) 구리도선 속의 자유전자: 무질서 열운동 방향 상쇄 2) 물의 흐름: 음,양 전하가 똑같이 흘러감 부호 상쇄 4. 전류의 정의 단위시간(1초) 동안에 흘러가는 알짜 전하량 i = dq dt 단위:[1 ampere = 1 A = 1 C/s] 5. 전류 밀도 단위 면적을 단위시간(1초) 동안에 지나가는 전하량, 방향은 전하의 동방향 J = ( n e ) v 유통 6. 전류밀도와 전류 사이의 관계 i = J⋅ dA

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27-4,5 저항과 비저항; 오옴의 법칙 1. 오옴(Ohm)의 법칙 1) 전류-전압 관계 i = ( 1 R ) V ; R 전기저항 [ 단위 : ohm = Ω = V/A],
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