电阻并联的计算公式? 并联电阻的计算公式
\u5e76\u8054\u7535\u963b\u8ba1\u7b97\u516c\u5f0f\u8ba1\u7b97\u65b9\u6cd5\u603b\u7535\u963b\u503c\u7684\u8ba1\u7b97
1/R\u603b=1/R1+1/R2+\u2026\u2026+1/Rn\uff0c\u5373\u603b\u7535\u963b\u7684\u5012\u6570\u7b49\u4e8e\u5404\u5206\u7535\u963b\u7684\u5012\u6570\u4e4b\u548c
\u7279\u522b\u7684\uff0c\u4e24\u7535\u963b\u5e76\u8054\u603b\u503c\u4e3a\uff1a R\u603b=\uff08R1*R2)/\uff08R1+R2\uff09
\u5bf9\u4e8en\u4e2a\u76f8\u7b49\u7684\u7535\u963b\u5e76\u8054\uff0c\u516c\u5f0f\u5c31\u7b80\u5316\u4e3aR\u5e76=R/n\u3002
\u6bd4\u5982\u95ee\u9898\u4e2d\u4e00\u4e2a\u7535\u963b20\u6b27\uff0c\u53e6\u4e00\u4e2a\u7535\u963b\u662f40\u6b27\uff0c\u5e76\u8054\u5728\u4e00\u8d77\u603b\u7535\u963b\u8ba1\u7b97\u65b9\u6cd5
\u2460\u5229\u7528\u516c\u5f0f R\u603b=\uff08R1*R2)/\uff08R1+R2\uff09
R\u603b=20*40/\uff0820+40\uff09=40/3
\u2461\u6309\u7167\u7535\u963b\u5e76\u8054\u516c\u5f0f 1/R\u603b=1/R1+1/R2+\u2026\u2026+1/Rn\uff0c\u5c06\u6bcf\u4e2a\u5206\u7535\u963b\u7684\u5012\u6570\u76f8\u52a0\uff0c\u518d\u6c42\u548c\u7684\u5012\u6570\u5c31\u662f\u5e76\u8054\u7684\u603b\u7535\u963b \u3002\u53731/20+1/40=3/40 \u90a3\u4e48\u603b\u7535\u963b\u5c31\u662f= 40/3\u3002
\u2460\u2461\u4e24\u79cd\u8ba1\u7b97\u7ed3\u679c\u76f8\u540c\uff0c\u5747\u662f40/3\uff0c\u7ea6\u7b49\u4e8e13.3\u3002
\u6269\u5c55\u8d44\u6599\uff1a1\u3001\u5e76\u8054\u7535\u8def\uff1a\u5e76\u8054\u7684\u5404\u652f\u8def\u7535\u538b\u76f8\u7b49\uff0c\u5e72\u8def\u7535\u6d41\u7b49\u4e8e\u5404\u4e2a\u652f\u8def\u548c\u3002
\u8868\u8fbe\u5f0f\uff1a\u7535\u963bR1R2R3\u2026\u2026Rn\u5e76\u8054,\u7535\u538bU1=U2=\u2026\u2026=Un\u5e72\u8def\u7535\u6d41\uff1aIn=I1+I2+\u2026\u2026+In\u7531\u4e8eP=UI,I=U/R\uff0c\u4ee3\u5165\uff0c\u5e76\u8054\u7535\u963b\u7684\u529f\u7387\u6bd4P1:P2:P3\u2026\u2026\uff1aPn=U1^2/R1:U2^2/R2\u2026\u2026Un^2/Rn=1/R1:R2\u2026\u20261/Rn\u7531\u4e8e\u662f\u7eaf\u7535\u963b\uff0c\u53d1\u70ed\u6bd4Q1:Q2\u2026\u2026\uff1aQn=Pn\u6bd4=1/R1:R2\u2026\u20261/Rn\u3002
2\u3001\u5e76\u8054\u7535\u8def\u4e2d\u7684\u5173\u7cfb
\u7535\u538b\u7684\u5173\u7cfb\uff1aU=U1=U2
\u7535\u6d41\u7684\u5173\u7cfb\uff1aI=I1+I2
\u7535\u963b\u7684\u5173\u7cfb\uff1a1/R=1/R1+1/R2
\u7535\u529f\u7684\u8ba1\u7b97\uff1aW=UIt
\u7535\u529f\u7387\u7684\u5b9a\u4e49\u5f0f\uff1aP=W/t
\u5e38\u7528\u516c\u5f0f\uff1aP=UI
\u7126\u8033\u5b9a\u5f8b\uff1aQ\u653e=I^2Rt
\u5bf9\u4e8e\u7eaf\u7535\u963b\u7535\u8def\u800c\u8a00\uff1aQ\u653e=I^2Rt =U^2t/R=UIt=Pt=UQ=W
\u7167\u660e\u7535\u8def\u7684\u603b\u529f\u7387\u7684\u8ba1\u7b97\uff1aP=P1+P1+\u2026\u2026
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-\u5e76\u8054\u7535\u963b
\u5e76\u8054\u7535\u8def\u4e2d\u7684\u7535\u963b\u5173\u7cfb
两个电阻并联R并=R1*R2/(R1+R2)=1欧姆*2欧姆/(1欧姆+2欧姆)=0.67欧姆
已知直径为1mm导线的电阻为0.1
那什直径为10mm的电阻是?0.01
两个电阻并联R并 0.67欧姆
1mm导线的电阻为0.1欧姆，
10mm的电阻是?0.001欧姆 .
这个问题很简单嘛！！！就用2楼的
并联电阻的计算
就用二楼的公式.
绛旓細骞惰仈鐢甸樆璁＄畻鍏紡锛1/R鎬=1/R1+1/R2+鈥︹+1/Rn锛屽嵆鎬荤數闃荤殑鍊掓暟绛変簬鍚勫垎鐢甸樆鐨勫掓暟涔嬪拰 鐗瑰埆鐨勶紝涓鐢甸樆骞惰仈鎬诲间负锛 R鎬=锛圧1*R2)/锛圧1+R2锛夊浜巒涓浉绛夌殑鐢甸樆骞惰仈锛屽叕寮忓氨绠鍖栦负R骞=R/n銆
绛旓細2.骞惰仈鐢甸樆鐨勬蹇 骞惰仈鐢甸樆鏄寚灏嗗涓數闃诲櫒鐨勪袱绔浉杩烇紝浣垮叾鍏变韩鐢靛帇婧愶紝骞朵笖姣忎釜鐢甸樆鍣ㄤ箣闂存病鏈変覆鑱旂殑杩炴帴銆傚湪骞惰仈鐢佃矾涓紝姣忎釜鐢甸樆鍣ㄩ兘鑳藉鑷敱鍦版帶鍒剁數娴侀氳繃瀹冪殑澶у皬銆3.骞惰仈鐢甸樆鐨勮绠楀叕寮 鏍规嵁娆у瀹氬緥鍜屽熀灏旈湇澶畾寰嬶紝鎴戜滑鍙互鎺ㄥ鍑哄苟鑱旂數闃荤殑璁＄畻鍏紡銆傚亣璁炬湁n涓鐢甸樆鍣ㄥ苟鑱杩炴帴锛屽畠浠垎鍒负1/R...
绛旓細1/R骞=1/R1+1/R2+1/R3鈥︹︿袱涓鐢甸樆骞惰仈R骞=R1*R2/(R1+R2)=1娆у*2娆у/(1娆у+2娆у)=0.67娆у 宸茬煡鐩村緞涓1mm瀵肩嚎鐨勭數闃讳负0.1 閭ｄ粈鐩村緞涓10mm鐨勭數闃绘槸?0.01
绛旓細骞惰仈鐢甸樆璁＄畻鏂规硶濡備笅銆1銆佹荤數闃诲鐨勮绠锛1/R鎬=1/R1+1/R2+1/Rn锛屽嵆鎬荤數闃荤殑鍊掓暟绛変簬鍚勫垎鐢甸樆鐨勫掓暟涔嬪拰銆傜壒鍒殑锛屼袱鐢甸樆骞惰仈鎬诲间负锛歊鎬=锛圧1*R2)/锛圧1+R2锛夊浜巒涓浉绛夌殑鐢甸樆骞惰仈锛屽叕寮忓氨绠鍖栦负R骞=R/n銆2銆佸埄鐢ㄥ叕寮廟鎬=锛圧1*R2)/锛圧1+R2锛夋寜鐓鐢甸樆骞惰仈鍏紡1/R鎬=1/R1+1/R2+...
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绛旓細鎴戞潵璇曪細鍏紡涓1/R锛濓紙1/R1锛+锛1/R2锛+锛1/R3锛+鈥︹1銆佸鏋滀笁涓竴鏍风殑鐢甸樆骞惰仈鐨璇濓紝涓嶇敤绠楃殑锛岀洿鎺ラ櫎浠3锛屽嵆10k/3娆с2銆佽缁嗗涓嬪浘锛氾紙涓変釜鐢甸樆涓嶄竴鏍蜂篃鏄繖涓叕寮忥級鍙傝冭祫鏂欙細鍘熷垱
绛旓細骞惰仈鐢甸樆璁＄畻鏂规硶濡備笅銆1銆佹荤數闃诲鐨勮绠锛1/R鎬=1/R1+1/R2+1/Rn锛屽嵆鎬荤數闃荤殑鍊掓暟绛変簬鍚勫垎鐢甸樆鐨勫掓暟涔嬪拰銆傜壒鍒殑锛屼袱鐢甸樆骞惰仈鎬诲间负锛歊鎬=锛圧1*R2)/锛圧1+R2锛夊浜巒涓浉绛夌殑鐢甸樆骞惰仈锛屽叕寮忓氨绠鍖栦负R骞=R/n銆2銆佸埄鐢ㄥ叕寮廟鎬=锛圧1*R2)/锛圧1+R2锛夋寜鐓鐢甸樆骞惰仈鍏紡1/R鎬=1/R1+1/R2+...
绛旓細涓鐢甸樆 R1銆丷2 骞惰仈锛岀瓑鏁堢數闃讳负 R锛屽叧绯讳负 1/R = 1/R1 + 1/R2
绛旓細涓鐢甸樆骞惰仈锛屽垯鍏朵袱绔數鍘嬪潎鐩哥瓑锛岃涓篣锛岀敱娆у瀹氬緥锛孯1鐢垫祦锛欼1=U/R1 R2鐢垫祦锛欼2=U/R2 鎬荤數娴佷负锛欼=I1+I2=U/R1+U/R2;鏁骞惰仈鐢甸樆涓 R骞=U/I=U/(U/R1+U/R2)=1/(1/R1+1/R2)=1/(1/30+(1/60))=20惟锛涜阿璋㈤噰绾筹紱
