两个电阻器并联阻值和功率是两个电阻器的总和吗;如果是串联呢? 并联两个电阻的并联电路中如果功率最大,那么两个电阻阻值应该相...
\u4e24\u4e2a\u963b\u503c\u548c\u74e6\u6570\u90fd\u4e0d\u4e00\u6837\u7684\u7535\u963b\u5668\u5e76\u8054\u5728\u4e00\u8d77\u963b\u503c\u548c\u74e6\u6570\u662f\u5b83\u4eec\u7684\u603b\u548c\u5417\uff0c\u5982\u679c\u662f\u4e32\u8054\u5462\uff1f\u4e0d\u662f\u3002\u4f60\u8bf4\u7684\u4e0d\u5bf9\u3002
\u4e32\u8054\u7535\u963b\u7684\u963b\u503c\uff0c\u7b49\u4e8e\u5404\u7535\u963b\u963b\u503c\u4e4b\u548c\uff1aR=R1+R2+R3\u2026\u2026
\u5e76\u8054\u7535\u963b\u7684\u963b\u503c\u7684\u5012\u6570\uff0c\u7b49\u4e8e\u5404\u7535\u963b\u963b\u503c\u5012\u6570\u4e4b\u548c\uff1a1/R=1/R1+1/R2+1/R3\u2026\u2026
\u6240\u8c13\u201c\u74e6\u6570\u201d\uff0c\u5373\u6563\u70ed\u529f\u7387\uff0c\u662f\u6307\u8be5\u7535\u963b\u7684\u6563\u70ed\u80fd\u529b\uff0c\u4e0e\u7535\u963b\u7684\u4f53\u79ef\u548c\u8010\u70ed\u6e29\u5ea6\u6709\u5173\uff0c\u4e0d\u7ba1\u662f\u4e32\u8054\u6216\u5e76\u8054\uff0c\u5176\u603b\u7684\u8010\u6563\u70ed\u80fd\u529b\u662f\u5404\u7535\u963b\u6563\u70ed\u80fd\u529b\u4e4b\u548c\uff0c\u4f46\u4e32\u8054\u7535\u8def\u6216\u5e76\u8054\u7535\u8def\u901a\u7535\u65f6\uff0c\u5404\u7535\u963b\u7684\u53d1\u70ed\u91cf\u51b3\u5b9a\u4e8e\u5b83\u83b7\u5f97\u7684\u7535\u538b\u548c\u7535\u6d41\u7684\u4e58\u79ef\uff0c\u4e0e\u6240\u8c13\u74e6\u6570\u65e0\u5173\u3002
\u4e24\u4e2a\u7535\u963b\u7684\u5e76\u8054\u5728\u7535\u8def\u4e2d
R\u603b=R1R2/(R1+R2)
P=U^2/R\u603b=U^2(R1+R2)R1R2
\u82e5\u4e24\u4e2a\u7535\u963b\u603b\u7535\u963b\u7684\u5408\u4e0d\u53d8\uff0c\u4e24\u4e2a\u7535\u963b\u963b\u503c\u76f8\u7b49\uff0c\u603b\u7535\u963b\u6700\u5927\uff0c\u603b\u529f\u7387\u6700\u5c0f
\u4e0d\u660e\u8ffd\u95ee
绛旓細濡傛灉鍦ㄧ數鍘嬩笉鍙樼殑鎯呭喌涓嬶紝涓や釜鍚屾牱鐨勭數闃诲苟鑱斿悗闃诲兼槸鍘熸潵鐨勪竴鍗婏紝鍔熺巼鏄師鏉ョ殑涓ゅ銆備袱涓悓鏍风殑鐢甸樆涓茶仈鍚庯紝闃诲兼槸鍘熸潵鐨勪袱鍊(鐩稿姞)锛屽姛鐜囨槸鍘熸潵鐨勪竴鍗(鍦ㄧ數鍘嬩笉鍙樼殑鎯呭喌涓)銆備緥濡傦細涓や釜2娆у1w鐢甸樆锛屽苟鑱斿悗涓1娆у2w锛屼覆鑱斿悗涓4娆у1w銆
绛旓細涓嶆槸銆備綘璇寸殑涓嶅銆涓茶仈鐢甸樆鐨勯樆鍊硷紝绛変簬鍚勭數闃婚樆鍊间箣鍜岋細R=R1+R2+R3鈥︹﹀苟鑱旂數闃荤殑闃诲肩殑鍊掓暟锛岀瓑浜庡悇鐢甸樆闃诲煎掓暟涔嬪拰锛1/R=1/R1+1/R2+1/R3鈥︹︽墍璋撯滅摝鏁扳濓紝鍗虫暎鐑姛鐜囷紝鏄寚璇ョ數闃荤殑鏁g儹鑳藉姏锛屼笌鐢甸樆鐨勪綋绉拰鑰愮儹娓╁害鏈夊叧锛屼笉绠℃槸涓茶仈鎴栧苟鑱旓紝鍏舵荤殑鑰愭暎鐑兘鍔涙槸鍚勭數闃绘暎鐑兘鍔涗箣鍜岋紝浣...
绛旓細P2=U2I2 鍒欙細P1锛歅2=U1I1锛歎2I2=R2锛歊1锛圛1銆両2鐩哥瓑锛岀害鎺変簡锛夊嵆骞惰仈鐢佃矾涓紝涓や釜鐢甸樆鐨勭數鍔熺巼涓庤繖涓や釜鐢甸樆鐨勯樆鍊兼垚鍙嶆瘮銆
绛旓細鍗曚釜鐢甸樆鐨勫姛鐜囨槸涓嶄細鍙樺寲鐨勶紝涓や釜鎴栬呭涓數闃诲苟鑱斿悗绛夋晥鐢甸樆鐨勫姛鐜囩瓑浜庡悇涓數闃诲姛鐜囦箣鍜锛屼絾鐢甸樆鍊间細鍙樺皬锛屽鏋滄兂闃诲间笉鍙橈紝灏辩敤4涓浉鍚岄樆鍊鐨勭數闃讳袱涓や覆鑱斿悗鍐嶅苟鑱旓紝绛夋晥鐢甸樆鍊艰窡鍗曚釜鐢甸樆鐨勯樆鍊肩浉鍚岋紝鍔熺巼涓哄崟涓數闃荤殑4鍊嶃
绛旓細涓や釜鐩稿悓鐢甸樆骞惰仈锛屼袱涓2M娆х數闃诲苟鑱旀槸1M娆銆傚姛鐜囧姞涓鍊嶃俁=1/(1/R1+1/R2+...+1/Rn)濡傛灉鏄袱涓數闃籖=R1R2/(R1+R2)
绛旓細涓や釜骞惰仈浠ュ悗P2=U²/锛圧/2锛=2*U²/R=2P=4W U鍙樼殑鎯呭喌涓嬶細鐢变簬涓や釜鐢甸樆涓茶仈,鎵浠ョ數闃昏愬帇鍙互澧炲ぇ鍒2U,杩欐牱姣忎釜鐢甸樆鐨勭數鍘嬪垎鐨刄,姣忎釜鐨勭數闃荤殑鍔熺巼杩樻槸2W,鍗冲彲杈惧埌2P=4W锛堥瀹氭儏鍐垫渶澶у硷級涓鐢甸樆骞惰仈,鑰愬帇鏃犳硶澧炲姞,鑰楁暎鍔熺巼杩樻槸鍚勮嚜鐨勯瀹氬姛鐜囩浉鍔,鍗4W,8,涓や釜涓茶仈杩樻槸2W 涓嶈繃闃...
绛旓細涓や釜2W鐢甸樆骞惰仈鏄锛2~4锛塛锛涳紙闃诲灏忕殑锛変竴缁鍔熺巼姣旇緝澶 銆
绛旓細濡傛灉鏄骞惰仈,閭d箞姣忎釜鐢甸樆涓婄殑鐢靛帇閮芥槸涓鏍风殑,鍒欎粬浠鐨勫姛鐜鍙拰鐢靛帇鍜岃嚜宸鐨勭數闃诲鏈夊叧.涔熷氨鏄,P1=U*U/R1,鍜孯2鐨勫ぇ灏忔病鏈夊叧绯.浣犻鐩槸涓嶆槸寮勯敊浜?鏄覆鑱斿惂?濡傛灉R2鏄唴闃,閭d箞鏍规嵁鏈澶у姛鐜囦紶閫掑畾鐞,褰揜1=R2鏃 R1鑾峰緱鏈澶у姛鐜嘝1=U*U/(4R1)
绛旓細鍥犱负I1=U/R1锛孖2=U/R2锛屽苟鑱旂數璺腑鍚勬敮璺袱绔數鍘婾鐩哥瓑锛岃嫢R2鏄疪1鐨浜鍊嶏紝鍒橧2灏辨槸I1鐨勪簩鍒嗕箣涓銆鐢甸樆骞惰仈鏃躲傛瘡涓數闃讳笂鐨鍔熺巼涓庨樆鍊鎴愬弽姣斻傚洜涓哄苟鑱旀椂锛孭1=UI1=U脳U/R1=U²/R1 P2=UI2=U脳U/R2=U²/R2 鑻2鏄疪1鐨勪簩鍊嶏紝鍒橮2灏辨槸P1鐨勪簩鍒嗕箣涓銆
绛旓細涓や釜鐢甸樆鐨勫苟鑱鍦ㄧ數璺腑 R鎬=R1R2/(R1+R2)P=U^2/R鎬=U^2(R1+R2)R1R2 鑻ヤ袱涓數闃绘荤數闃荤殑鍚堜笉鍙橈紝涓や釜鐢甸樆闃诲鐩哥瓑锛屾荤數闃绘渶澶э紝鎬鍔熺巼鏈灏 涓嶆槑杩介棶