电炉丝坏了，去掉1/4，接在原电路上，
\u7535\u7089\u4e1d\u65ad\u4e86\uff0c\u53bb\u63891/5\u540e\uff0c\u4ecd\u7136\u63a5\u5728\u539f\u6765\u7684\u7535\u6e90\u4e24\u7aef\uff0c\u5219\u5728\u76f8\u540c\u65f6\u95f4\u5185\u4ea7\u751f\u7684\u70ed\u91cf\u4e0e\u539f\u6765\u7684\u70ed\u91cf\u4e4b\u6bd4\u4e3a5\uff1a4\u7535\u7089\u4e1d\u53bb\u63891/5\u540e\uff0c\u957f\u5ea6\u53d8\u4e3a\u539f\u6765\u76844/5\uff0c\u5219\u7535\u963b\u4e5f\u53d8\u4e3a\u539f\u6765\u76844/5\uff0c\u6839\u636eQ=U^2*t/R\uff0c\u5728\u7535\u538b\u548c\u901a\u7535\u65f6\u95f4\u76f8\u540c\u7684\u60c5\u51b5\u4e0b\uff0cR\u53d8\u4e3a\u539f\u6765\u76844/5\uff0c\u5219\u4ea7\u751f\u7684\u70ed\u91cf\u53d8\u4e3a\u539f\u6765\u76845/4\uff0c\u5373\u5728\u76f8\u540c\u65f6\u95f4\u5185\u4ea7\u751f\u7684\u70ed\u91cf\u4e0e\u539f\u6765\u70ed\u91cf\u4e4b\u6bd4\u4e3a5:4
w/t=IV/T
R1=a.R2=(3/4)a
I=V/R:V/R1:V/R2
V/a:V/(3/4)a
1:4/3
A\u7126\u8033\u5b9a\u5f8b\u53cd\u6620\u4e86\u7535\u80fd\u8f6c\u5316\u4e3a\u70ed\u7684\u89c4\u5f8b\u3002
太短了电炉丝会烧坏的
太短了受热物体面积小 不易受热
绛旓細鐞嗙敱锛氬绾胯秺闀匡紝鐢甸樆瓒婂ぇ銆傚绾垮彉鐭负鍘熸潵鐨3/4锛屾墍浠ョ數闃诲氨鐩稿簲鐨勫噺灏忎负鍘熸潵鐨3/4銆傛牴鎹劍鑰冲畾寰婹=I2Rt锛屾湰棰樹腑I鍜孴娌″彉锛孯鍙樹负鍘熸潵鐨3/4锛屾墍浠鍙樹负鍘熸潵鐨3/4锛屾墍浠ュ湪鐩稿悓鏃堕棿鍐呬骇鐢熺殑鐑噺涓庡師鏉ヤ骇鐢熺殑鐑噺涔嬫瘮涓1锛3/4锛屽嵆4锛3 ...
绛旓細鍘绘帀1/4鐢甸樆鍑忓皬鐢垫祦澧炲姞锛屾牴鎹姛鐜嘝=U^2/R,鍔熺巼浼氬鍔狅紝鍙戠儹閲忓澶锛岀數鐐変笣娓╁害鍗囬珮锛屽瓒呰繃鐢电倝涓濈殑鐔旂偣灏变細瀵艰嚧鐢电倝涓濈儳鏂
绛旓細鐢甸樆鍑忓皬锛岀數娴佸澶
绛旓細鐢变簬鍘绘帀涓鍗婄數鐑涓濓紝鍥犳鐢甸樆鍑忓皬涓鍗婏紝鎺ュ湪鍘熺數婧愪笂锛岀數娴佸ぇ涓鍊嶏紱鍔熺巼鏄數鍘嬩箻浠ョ數娴侊紝鍥犳锛屽姛鐜囧ぇ涓鍊嶏紱鍔熺巼澶т竴鍊嶏紝鐩稿悓鏃堕棿鍐呬骇鐢熺殑鐑噺姣斿師鏉ヤ骇鐢熺殑鐑噺涔熷ぇ涓鍊嶃
绛旓細鎶婄數鐐変笣鐑у潖鐨勫湴鏂瑰壀鎺変竴灏忔鍐嶆帴鍏ョ數璺锛岀數鐐変笣鐨勬潗鏂欍佹í鎴潰绉笉鍙樿岄暱搴﹀彉鐭紝瀵间綋鐢甸樆R鍙樺皬锛岀數婧愮數鍘婾涓嶅彉锛岀敱P= U 2 R 鍙煡锛岀數鐐夊瓙鐨勭數鍔熺巼鍙樺ぇ锛屽ぇ浜1000W锛岀敱W=Pt鍙煡锛岀數鐐夊瓙鍦1s鍐呬骇鐢熺殑鐑噺澶т簬1000J锛涙晠閫堿锛
绛旓細鎶婄數鐐変笣鐑у潖鐨勫湴鏂瑰壀鎺変竴灏忔鍐嶆帴鍏ョ數璺锛岀數鐐変笣鐨勬潗鏂欍佹í鎴潰绉笉鍙樿岄暱搴﹀彉鐭紝瀵间綋鐢甸樆R鍙樺皬锛岀數婧愮數鍘婾涓嶅彉锛岀敱P=U2R鍙煡锛岀數鐐夊瓙鐨勭數鍔熺巼鍙樺ぇ锛屽ぇ浜1000W锛岀敱W=Pt鍙煡锛岀數鐐夊瓙鍦1s鍐呬骇鐢熺殑鐑噺澶т簬1000J锛涙晠閫堿锛
绛旓細w/t=IV/T R1=a.R2=(3/4)a I=V/R:V/R1:V/R2 V/a:V/(3/4)a 1:4/3 A鐒﹁冲畾寰嬪弽鏄犱簡鐢佃兘杞寲涓虹儹鐨勮寰嬨
绛旓細瑙ｏ細鐢靛帇U涓嶅彉锛孯鍙樹负鍘熸潵鐨3/4 鐢垫祦鍙樹负鍘熸潵鐨4/3 W鏂=锛4I/3锛塣2脳3R/4 =16/9脳3/4RI^2 =4/3RI^2 =4/3W 鍥犳閫塂
绛旓細鍥炲埌棰樼洰锛鐢电倝涓濆潖浜嗭紝鍘绘帀浜斿垎涔 -->鐢甸樆=鍘熸潵鐨4/5 鐢靛帇 鏃堕棿涓嶅彉銆傚洜涓 W=t*U^2/R (鍔熶笌鐢甸樆鎴愬弽姣旓級鎵浠 鍦ㄧ浉鍚岀殑鏃堕棿鍐呬骇鐢熺殑鐑噺涓庡師鏉ヤ骇鐢熺殑鐑噺涔嬫瘮=5:4 !!! 杩欐槸鍒濅笁鐗╃悊鐨勭瓟妗堛傚湪瀹為檯涓紝鐑噺浼氬鍔犱篃鏄鐨勩備絾鏇村鐨勬彁閱掓槸锛氳繖鏄笉瀹夊叏锛堢敤鐢碉級鐨勩傚疄闄呯敓娲讳腑鍗冧竾涓嶈...
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