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6/03/2014 16:11 เมื่อ 6/03/2014 อ่าน 405 | ตอบ 2

กฎของโอห์ม

George Simon Ohm นักฟิสิกส์ชาวเยอรมัน พบว่า เมื่อทำให้ปลายทั้งสองของลวดโลหะ มีความต่างศักย์ไฟฟ้า จะมีกระแสไฟฟ้าผ่านลวดโลหะนี้ ซึ่งจากการทดลองจะได้ความสัมพันธ์ของ กระแสไฟฟ้าและความต่างศักย์ไฟฟ้า

   กระแสไฟฟ้าที่ผ่านลวดโลหะมีค่าแปรผันตรงกับความต่างศักย์ไฟฟ้า ระหว่างปลายทั้งสองของลวดโลหะ
                 เขียนความสัมพันธ์ได้ดังนี้ …
                                                                I               µ           V
                 ดังนั้น …
                                                                I               =              kV    (k เป็นค่าคงตัวของการแปรผัน)

                จะได้ว่า …

กฎของโอห์ม 'เมื่ออุณหภูมิคงที่ ค่าของกระแสไฟฟ้าที่ผ่านโลหะตัวนำหนึ่งจะมีค่าแปรผัน ตรงกับความต่างศักย์ไฟฟ้าระหว่างปลายทั้งสองของตัวนำนั้น โดยอัตราส่วนระหว่างความต่างศักย์ไฟฟ้ากับกระแสไฟฟ้าย่อมมีค่าคงที่ เรียกว่า ความต้านทาน'

ความคิดเห็น :

1

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	Joy [68.202.141.xxx] เมื่อ 4/03/2019 23:19

2

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\|	Sue [69.85.105.xxx] เมื่อ 10/03/2019 02:05

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