[問題] 高壓送電中 能量守恆與歐姆定律的矛盾
【出處】自己從學習國中課本即開始的疑惑
【題目】
借圖
http://macao.communications.museum/images/exhibits/2_4_2_4.png
![](http://macao.communications.museum/images/exhibits/2_4_2_4.png)
1. 假設左端初級線圈是一個功率固定的電源,因此次級線圈提供的功率也會固定
2. 當我們將次級線圈的匝數提高,電壓也隨之提高
3. 因為P=IV,所以次級線圈上的電流下降了
(這是課本告訴我們為什麼長途輸送電路要使用高壓電的原因。)
【瓶頸】(解題瓶頸或思考脈絡,請盡量詳述以利回答者知道要從何處講解指導)
我的考慮是:
4. 以右端的負載電器來看,假如它是歐姆體,符合歐姆定律
5. V=IR ,當電壓提升時,電流應該要隨之提升
6. 這個電流與次級線圈的電流在同一條導線中,是一樣大的。
所以這裡產生了矛盾:電流究竟是提升還是下降呢?
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