如何判断电桥是否真正达到平衡? 1.电桥法测量电阻的原理是什么?如何判断电桥平衡?
\u600e\u6837\u5224\u65ad\u7535\u6865\u662f\u5426\u771f\u6b63\u8fbe\u5230\u5e73\u8861\u60e0\u65af\u767b\uff1f\u7b80\u5355\u7684\u8bf4\uff0c\u68c0\u6d41\u8ba1\u793a\u6570\u4e3a\u96f6\uff08\u5927\u6982\uff09\u5c31\u53ef\u4ee5\u4e86
\u7535\u6e90\u63a5\u901a\u65f6\uff0c\u7535\u6865\u7ebf\u8def\u4e2d\u5404\u652f\u8def\u5747\u6709\u7535\u6d41\u901a\u8fc7\u3002\u5f53C\u3001D\u4e24\u70b9\u4e4b\u95f4\u7684\u7535\u4f4d\u4e0d\u76f8\u7b49\u65f6\uff0c\u6865\u8def\u4e2d\u7684\u7535\u6d41 \uff0c\u68c0\u6d41\u8ba1\u7684\u6307\u9488\u53d1\u751f\u504f\u8f6c\u3002
\u5f53C\u3001D\u4e24\u70b9\u4e4b\u95f4\u7684\u7535\u4f4d\u76f8\u7b49\u65f6\uff0c\u6865\u8def\u4e2d\u7684\u7535\u6d41 \uff0c\u68c0\u6d41\u8ba1\u6307\u9488\u6307\u96f6\uff08\u68c0\u6d41\u8ba1\u7684\u96f6\u70b9\u5728\u523b\u5ea6\u76d8\u7684\u4e2d\u95f4\uff09\uff0c\u8fd9\u65f6\u6211\u4eec\u79f0\u7535\u6865\u5904\u4e8e\u5e73\u8861\u72b6\u6001\u3002
R\u4fdd\u62a4\u4e3a\u8f83\u5927\u7684\u53ef\u53d8\u7535\u963b\uff0c\u5728\u7535\u6865\u4e0d\u5e73\u8861\u65f6\u53d6\u6700\u5927\u7535\u963b\u4f5c\u9650\u6d41\u4f5c\u7528\u4ee5\u4fdd\u62a4\u68c0\u6d41\u8ba1\uff1b\u5f53\u7535\u6865\u63a5\u8fd1\u5e73\u8861\u65f6\u53d6\u6700\u5c0f\u503c\u4ee5\u63d0\u9ad8\u68c0\u6d41\u8ba1\u7684\u7075\u654f\u5ea6\u3002\u9650\u6d41\u7535\u963b\u7528\u4e8e\u9650\u5236\u7535\u6d41\u7684\u5927\u5c0f\uff0c\u4e3b\u8981\u76ee\u7684\u5728\u4e8e\u4fdd\u62a4\u68c0\u6d41\u8ba1\u548c\u6539\u53d8\u7535\u6865\u7075\u654f\u5ea6\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u8fde\u63a5R1\u548cR2\u7684\u56db\u6839\u5bfc\u7ebf\u7684\u6a2a\u622a\u9762\u79ef\u8981\u8db3\u591f\u5927\uff0c\u957f\u5ea6\u8981\u5c3d\u53ef\u80fd\u77ed\u4e9b\uff0c\u63a5\u7ebf\u7aef\u4fdd\u6301\u826f\u597d\uff0c\u4ee5\u5c3d\u91cf\u51cf\u5c11\u9644\u52a0\u7535\u963b\u548c\u6d4b\u8bd5\u8bef\u5dee\u3002\u68c0\u6d41\u8ba1G\u5141\u8bb8\u901a\u8fc7\u7684\u7535\u6d41\u7684\u6700\u5927\u503c\u5f88\u5c0f\uff08J0409\u578b\u4e3a300\u5fae\u5b89\uff09\uff0c\u5e94\u52a0\u4fdd\u62a4\u7535\u963b\u3002
\u4e0d\u8981\u8ba9\u7535\u6d41\u957f\u65f6\u95f4\u901a\u8fc7G\u7279\u522b\u662f\u7535\u6865\u672a\u8fbe\u5230\u5e73\u8861\u65f6\u3002\u5c06D\u7684\u6309\u952e\u5f00\u5173\u6309\u4e0b\u53bb\u65f6\u4e0d\u8981\u7528\u529b\u8fc7\u5927\uff0c\u4e5f\u4e0d\u8981\u6309\u4f4f\u5728\u7535\u963b\u4e1d\u4e0a\u6ed1\u52a8\uff0c\u4ee5\u514d\u78e8\u635f\u7535\u963b\u4e1d\u3002
\u7535\u963b\u4e1d\u5982\u8868\u9762\u6c27\u5316\u6216\u751f\u9508\uff0c\u53ef\u5728\u7535\u963b\u4e1d\u4e0b\u57ab\u4e24\u5c42\u539a\u7eb8\uff0c\u518d\u7528\u7ec6\u7802\u7eb8\u6469\u64e6\u7535\u963b\u4e1d\uff0c\u5c06\u5176\u8868\u9762\u64e6\u51c0\u3002\u57ab\u7eb8\u7684\u4f5c\u7528\u662f\u9632\u6b62\u523b\u5ea6\u5c3a\u8868\u9762\u635f\u574f\u3002
绛旓細骞宠 鐢垫ˉ=涓ょ偣闂存病鏈夌數娴=鐢靛帇涓0=涓や釜绔偣鐢靛娍鐩哥瓑锛屽湪骞惰仈鐢佃矾涓彲浠ヨ繖鏍鍒ゆ柇锛氫竴鏉¤矾涓婄數鍘嬫寜鐢甸樆澶у皬鍒嗛厤锛屾瘮濡傝鐢垫簮鐢靛帇涓6V锛岀數闃讳负1娆у拰2娆ч偅涔1娆у垎鍒颁簡涓や紡鐢靛帇锛堝彲鐪嬩綔1娆х數闃诲乏鍙充袱绔數鍔垮樊涓2v锛夊彟涓鏉¤矾鐢甸樆涓3娆у拰6娆ч偅涔3娆у垎鍒颁袱浼忕數鍘嬶紙宸﹀彸涓ょ鐢靛娍宸负2v锛夊洜涓轰袱鏉℃敮璺氦鐐...
绛旓細褰鐢垫ˉ杈惧埌骞宠 鐘舵佹椂锛屾湁鐗瑰畾鐨勬潯浠堕渶瑕佹弧瓒炽傞鍏堬紝B銆丏涓ょ偣鐨勭數浣嶇浉绛夛紝杩欐剰鍛崇潃A銆丅涔嬮棿鐨勭數鍘嬬瓑浜嶢銆丏涔嬮棿鐨勭數鍘嬶紝鍚屾牱锛孊銆丆闂寸殑鐢靛帇涔熺瓑浜嶥銆丆闂寸殑鐢靛帇锛屽嵆UAB=UAD涓擴BC=UDC銆傚湪骞宠 鐘舵佷笅锛岄氳繃妫娴佽鐨勭數娴両g涓洪浂锛岃〃绀篈B鍜孊C涓よ噦鐨勭數娴両鐩哥瓑锛孉D鍜孌C涓よ噦鐨勭數娴両'涔熺浉绛夈傚埄鐢ㄦ濮嗗畾寰...
绛旓細灏哛1銆丷2涓茶仈.鍐嶅皢R3銆丷4涓茶仈.鐒跺悗灏嗕簩鑰呭苟鑱.鐒跺悗灏哛1銆丷2鐨勪腑闂村拰R3銆丷4鐨勪腑闂寸敤鐢ㄥ绾胯繛鎺.绉扮數妗ョ數璺.灏嗘暣涓數璺帴鍏ョ數婧愪簩绔.褰撹繛鎺ョ殑瀵肩嚎涓棤鐢垫祦閫氳繃鏃.鐢垫ˉ骞宠 銆鍒ゆ柇鐢垫ˉ骞宠 鏃.鍙灏嗕竴鐢垫祦琛ㄦ垨鐢靛帇 琛ㄦ帴鍦ㄤ腑闂磋繛鎺ョ殑瀵肩嚎涓,鑻ョ數琛ㄦ棤璇绘暟.鍗崇數妗ュ钩琛.
绛旓細1銆鐢垫ˉ鏈夌數婧愩佺數闃汇佹娴佽缁勬垚銆傚叾涓洓涓數闃昏繛鎴愬洓杈瑰舰锛岀О涓虹數妗ョ殑鍥涗釜鑷傦紝鍥涜竟褰㈢殑涓涓瑙掔嚎杩炴湁妫娴佽锛岀О涓衡滄ˉ鈥濄2銆佺數妗ョ殑骞宠 鏉′欢鏄細鐢垫ˉ鐩稿鑷傜數闃荤殑涔樼Н鐩哥瓑锛屽嵆閫氳繃妗ヨ矾鐨勭數娴佺瓑浜庨浂锛屼篃灏辨槸璇达紝妫娴佽鎸囬拡鎸囩ず闆躲
绛旓細涓婂浘涓殑锛坅锛夈侊紙b锛夈侊紙c锛変笁涓數璺兘鏄骞宠 鐢垫ˉ锛孉B涓ょ鍔犵數鍘嬫簮銆佺數娴佹簮銆佸紑璺佺煭璺紝瀵笴D涓ょ鐨勫叧绯绘病浠讳綍褰卞搷銆傚弽杩囨潵涔熶竴鏍枫侰D涓ょ鐨勭姸鎬佷笌AB娌″叧绯汇傚浘涓殑姣忎竴涓數闃绘瀯鎴愪竴涓滄ˉ鑷傗濓紝鎵浠ョ數妗ユ湁鍥涗釜妗ヨ噦銆鐢垫ˉ鏄惁骞宠 鐨鍒ゆ柇锛氫袱缁勫瑙掞紙(c)鐨勭敾娉曪級鎴栧闈紙(a)銆(b)鐨勭敾娉曪級...
绛旓細褰撶粨鐐归棿鐨 鐢靛娍鐩稿悓鏃 杩欐椂鐢垫ˉ澶勪簬骞宠 鍥涗釜鐢甸樆鏃禦1XR4 = R2XR3 鐢垫祦骞宠 鍗抽氳繃璋冭妭姣斾緥鑷備笌娴嬮噺鑷,浼肩殑鐢垫ˉ鐨勬ˉ鑷傚钩琛,姝ゆ椂妗ヤ袱绔數浣嶇浉绛,閫氬父浣跨敤妗ヤ箣闂存帴涓涓伒鏁忔娴佽鏉鍒ゆ柇.褰撴娴佽鏃犵數娴佹椂鍊,妗ヨ噦闂村瓨鍦ㄧǔ瀹氱殑姣斾緥鍏崇郴,浠庤岃绠楀嚭寰呮鑷傜殑鐢甸樆.褰撶劧鍒╃敤姝ゆ瘮渚嬪钩寰堝師鐞,涔熷彲浠ユ祴閲忕數鎰,...
绛旓細涔熷彲浠ヤ娇鐢ㄦ埓缁村崡瀹氱悊锛屽皢鍏朵腑鎵姹傜殑鐢甸樆浠庣數璺腑鏂紑锛岀畝鍖栫數璺粨鏋勶紝鍙互鏂逛究姹傝В銆備笂杩版槸瀵逛簬鐩存祦鐢佃矾鑰岃█鐨勶紝濡傛灉鏄氦娴佺數璺紝鍏朵腑4涓數闃讳綅缃彲浠ユ槸鐢甸樆銆佺數鎰熴佺數瀹癸紝鎴栬呮槸瀹冧滑鐨勪覆鑱旂粍鍜岋紝灏辩粍鎴愪簡浜ゆ祦鐢垫ˉ銆傚鏋滅敤Z1銆乑2鍜孼3銆乑4琛ㄧず锛屽湪Z1脳Z4=Z2脳Z4鏃讹紝绉颁负浜ゆ祦骞宠 鐢垫ˉ銆
绛旓細鎵璋鐢垫ˉ杈惧埌骞宠 鏄寚锛岀數妗ヤ腑妫娴佽鐨勭ず鏁颁负闆讹紝璇存槑妫娴佽鎵鍦ㄧ數璺病鏈夌數娴侀氳繃锛屼袱绔殑鐢靛娍鐩哥瓑銆傜數妗ユ硶娴嬮噺鐢甸樆锛屽繀椤诲湪鐢垫ˉ骞宠 鐨勬椂鍊欒繘琛屾祴閲忋
绛旓細涓轰簡杈惧埌鐢垫ˉ鐨骞宠 鐘舵侊紝鍙互閫氳繃璋冩暣鐢佃矾涓殑鏌愪簺鍙傛暟鏉ュ疄鐜般備緥濡傦紝鏀瑰彉鐢佃矾涓煇涓數闃荤殑闃诲硷紝鎴栬呰皟鏁寸數婧愮數鍘嬬瓑銆傝繖浜涙搷浣滈渶瑕佹牴鎹疄闄呮儏鍐佃繘琛岋紝浠ョ‘淇濈數妗ヨ兘澶熷噯纭湴宸ヤ綔銆傚悓鏃讹紝杩橀渶瑕佸鐢垫ˉ杩涜瀹氭湡鐨勬牎鍑嗗拰缁存姢锛屼互淇濊瘉鍏舵祴閲忕粨鏋滅殑鍑嗙‘鎬у拰鍙潬鎬с傛讳箣锛岀數妗ョ殑骞宠 鏉′欢鏄數璺腑鐨勯噸瑕佺姸鎬侊紝鍙湁鍦...
绛旓細妫娴佽鎸囬拡鎸囬浂涓嶄竴瀹氳〃绀鐢垫ˉ涓瀹骞宠 銆傛儬鏂氱數妗ユ祴鐢甸樆瀹為獙涓娴佽鎸囬拡鍋忚浆杩囧ぇ锛岃鏄庢娴佽鐨勭殑鐏垫晱搴﹁皟鑺傜殑澶ぇ浜嗐傛娴佽鐏垫晱搴﹁秺澶э紝璇樊瓒婂皬锛屾墍浠ョ伒鏁忓害搴旇灏介噺璋冨ぇ銆備絾鏄伒鏁忓害涔熶笉鏄秺澶ц秺濂界殑锛岀伒鏁忓害澶ぇ锛岀數妗ヤ細寰堥毦璋冨钩琛°傛墍浠ュ繀椤婚夋嫨鍚堥傜殑妫娴佽鐏垫晱搴︺