4个电阻,电阻值都是R把他们并联起来总电阻是R/4为什么
并联电阻等效电阻计算公式1/r=(1/R1)+(1/R2))+(1/R3))+(1/R4)
因为 R1=R2=R3=R4=R
所以1/r =4(1/R)
r =R/4
绛旓細9绉嶏紙璁炬瘡涓鐢甸樆涓篟锛1銆4涓兘骞惰仈锛氱瓑鏁堢數闃讳负0.25R 2銆4涓兘涓茶仈锛氱瓑鏁堢數闃讳负4R 3銆4銆5銆6銆7銆8銆9濡傚浘鎵绀猴紙鏈変袱绉闃诲涓鏍凤紝鍙畻涓绉嶏級璇风偣鍑婚噰绾筹紝涓嶆槑鍙拷闂
绛旓細涓茶仈锛歳+r+r+r=4r 骞惰仈锛1/(1/r+1/r+1/r+1/r)=r/4
绛旓細鍥涗釜闃诲涓篟鐨鐢甸樆锛鍙粡杩囬傚綋鐨勮繛鎺ワ紝鍏辨湁15 绉嶅彲鑳 鍙栦竴涓 R 鍙栦簩涓 2R R/2 鍙栦笁涓 3R R/3 1.5R 2R/3 鍥涗釜鍏 4R R/4 2.5R 5R/3 3R/4 R/4 5R/3 2R/5
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绛旓細2.涓や釜鐢甸樆鍊煎畬鍏ㄧ浉绛夌殑鐢甸樆,鑻ュ苟鑱斿悗鐨勬荤數闃绘槸10娆у,鍒欏皢瀹冧滑涓茶仈鐨勬荤數闃绘槸銆 銆 A.5娆у B.10娆у C.20娆у D.40娆у 3.涓鏉″绾跨殑鐢甸樆鏄疪,鎶婂畠瀵规姌鍒嗘垚绛夐暱鐨勪袱娈靛悗,鍐嶆妸杩欎袱娈靛苟鑱旇捣鏉ヤ娇鐢,杩欐椂鐢甸樆 鏄斻 A. R/4 B.R/2 C. R/2 4.4涓數闃,鐢甸樆鍊奸兘鏄疪,鎶婂畠浠苟鑱旇捣鏉,鎬荤數闃绘槸銆...
绛旓細2.涓や釜鐢甸樆鍊煎畬鍏ㄧ浉绛夌殑鐢甸樆,鑻ュ苟鑱斿悗鐨勬荤數闃绘槸10娆у,鍒欏皢瀹冧滑涓茶仈鐨勬荤數闃绘槸銆 銆 A.5娆у B.10娆у C.20娆у D.40娆у 3.涓鏉″绾跨殑鐢甸樆鏄疪,鎶婂畠瀵规姌鍒嗘垚绛夐暱鐨勪袱娈靛悗,鍐嶆妸杩欎袱娈靛苟鑱旇捣鏉ヤ娇鐢,杩欐椂鐢甸樆 鏄斻 A. R/4 B.R/2 C. R/2 4.4涓數闃,鐢甸樆鍊奸兘鏄疪,鎶婂畠浠苟鑱旇捣鏉,鎬荤數闃绘槸銆...
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