1/4
所有跟帖:
• 对,发热量应该只有1/4. -白云青山- ♂ (0 bytes) () 08/28/2016 postreply 12:15:26
• 看来初中物理没学好,I是随电压变化的。应该是1/4或以下。P=UI=U^2/R。所以R不变的情况下是1/4。实际上R是随温度有变 -sfbayparent- ♂ (115 bytes) () 08/28/2016 postreply 14:08:36
• 对,发热量应该只有1/4. -白云青山- ♂ (0 bytes) () 08/28/2016 postreply 12:15:26
• 看来初中物理没学好,I是随电压变化的。应该是1/4或以下。P=UI=U^2/R。所以R不变的情况下是1/4。实际上R是随温度有变 -sfbayparent- ♂ (115 bytes) () 08/28/2016 postreply 14:08:36
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