如图所示，电源电压U=12V，R 1 为定值电阻，阻值为100Ω，R为滑动变阻器，R的最大阻值为50Ω，电流表量程 （2014?如皋市模拟）如图所示，电源电压U=12V，R1为...
\u5982\u56fe\u6240\u793a\uff0c\u7535\u6e90\u7535\u538bU\u7b49\u4e8e12V\uff0cR\u4e3a\u5b9a\u503c\u7535\u963b\uff0c\u963b\u503c\u4e3a100\u6b27\u59c6\uff0cR\u4e3a\u6ed1\u52a8\u53d8\u963b\u5668\uff0cR\u7684\u6700\u5927\u963b\u503c\u4e3a501)\u706f\u6ce1\u6b63\u5e38\u5de5\u4f5c\u65f6\u7535\u6d41=3/6=0.5A\uff0c\u4e5f\u53ef\u4ee5\u4ece\u5173\u7cfb\u56fe\u4e0a\u7684\u7ea2\u7ebf\u770b\u5230\u3002
2)\u53eaS\u95ed\u5408\uff0c\u706f\u6ce1\u548c\u53d8\u963b\u5668\u5728\u7535\u8def\u4e0a\u4e32\u8054\uff0c\u5982\u679c\u706f\u6ce1\u4e24\u7aef\u7535\u538b=4v \u5373\u53d8\u963b\u5668\u4e24\u7aef\u7535\u538b=12-4=8v\uff0c\u4ece\u5173\u7cfb\u56fe\u4e0a\u7eff\u8272\u7ebf\u770b\u5230\u706f\u6ce14v\u65f6\u7535\u6d41=0.4A\uff0c\u6d41\u8fc7\u53d8\u963b\u5668\u7535\u6d41\u4e00\u6837\u5373 R=8/0.4=20\u6b27\u3002
3)S S1 S2\u90fd\u95ed\u5408\uff0c\u706f\u6ce1\u88abS1\u77ed\u8def\u5373\u53ea\u5269R R1\u5e76\u8054\u5728\u7535\u8def\u4e0a\uff0cP=U I \uff0cU\u4e0d\u53d8\u5373P\u8ddf I \u6210\u6b63\u6bd4\uff0c\u800c\u7535\u6d41\u8868\u91cf\u7a0b\u6700\u59270.6A\uff0c\u4ee5\u6700\u5927\u7535\u6d41=0.6A\u8ba1\u7b97\u5373\u7535\u8def\u603b\u963b\u503c=20\u6b27\uff0c\u5df2\u77e5R1=100\u6b27\uff0cR=25\u6b27\u3002\u6700\u5927\u603b\u529f\u7387=0.6x12=7.2W\u3002
\u89e3\u7b54\uff1a\u5df2\u77e5\uff1aU\u989d=6V P\u989d=3W UL=4V I=0.4A U=12V R1=100\u03a9 I\u6700\u5927=0.6A\u6c42\uff1a\uff081\uff09I\u6b63\u5e38=\uff1f\uff082\uff09R\u4e32=\uff1f\uff083\uff09R\u5e76=\uff1fP\u6700\u5927=\uff1f\u89e3\uff1a\uff081\uff09\u2235P=UI \u2234\u706f\u6ce1\u6b63\u5e38\u5de5\u4f5c\u65f6\u901a\u8fc7\u706f\u4e1d\u7684\u7535\u6d41\u4e3aI\u6b63\u5e38=P\u989dU\u989d=3W6V=0.5A\uff1b\uff082\uff09S\u95ed\u5408\uff0cS1\u3001S2\u90fd\u65ad\u5f00\u65f6\uff0c\u6ed1\u52a8\u53d8\u963b\u5668\u4e0e\u706f\u6ce1\u4e32\u8054\uff0cI=0.4A\u6ed1\u52a8\u53d8\u963b\u5668\u4e24\u7aef\u7535\u538b\u4e3aU\u4e32=U-UL=12V-4V=8V\u6ed1\u52a8\u53d8\u963b\u5668\u63a5\u5165\u7535\u8def\u7684\u963b\u503c\u4e3aR\u4e32=U\u4e32I=8V0.4A=20\u03a9\uff1b\uff083\uff09S\u3001S1\u3001S2\u90fd\u95ed\u5408\u65f6\uff0c\u5b9a\u503c\u7535\u963bR1\u4e0e\u6ed1\u52a8\u53d8\u963b\u5668\u5e76\u8054\uff0c\u7535\u6d41\u8868\u901a\u8fc7\u7684\u6700\u5927\u7535\u6d41\u4e3a0.6A\uff0c\u7535\u8def\u6d88\u8017\u7684\u6700\u5927\u603b\u529f\u7387\u4e3aP\u6700\u5927=UI\u6700\u5927=12V\u00d70.6A=7.2W \u901a\u8fc7\u5b9a\u503c\u7535\u963bR1\u7684\u7535\u6d41\u4e3aI1=UR1=12V100\u03a9=0.12A\u2234\u901a\u8fc7\u6ed1\u52a8\u53d8\u963b\u5668\u7684\u6700\u5927\u7535\u6d41\u4e3aI\u5e76=I\u6700\u5927-I1=0.6A-0.12A=0.48A\u6ed1\u52a8\u53d8\u963b\u5668\u63a5\u5165\u7535\u8def\u7684\u6700\u5c0f\u963b\u503c\u4e3aR\u5e76=UI\u5e76=12V0.48A=25\u03a9\uff0e\u7b54\uff1a\uff081\uff09\u706f\u6ce1\u6b63\u5e38\u5de5\u4f5c\u65f6\u901a\u8fc7\u706f\u4e1d\u7684\u7535\u6d41\u4e3a0.5A\uff1b\uff082\uff09\u6ed1\u52a8\u53d8\u963b\u5668\u63a5\u5165\u7535\u8def\u7684\u963b\u503c\u4e3a20\u03a9\uff1b\uff083\uff09\u5f53\u6ed1\u52a8\u53d8\u963b\u5668\u63a5\u5165\u7535\u8def\u7684\u963b\u503c\u4e3a25\u03a9\u65f6\uff0c\u6574\u4e2a\u7535\u8def\u6d88\u8017\u7684\u603b\u529f\u7387\u6700\u5927\uff0c\u6700\u5927\u603b\u529f\u7387\u662f7.2W\uff0e
| （1）0.5A（2）20Ω（3）25Ω 7.2W 绛旓細瑙ｏ細锛1锛夌伅娉℃甯稿彂鍏夋椂锛屼袱绔殑鐢靛帇涓篣 L =6V锛屽姛鐜嘝 L =3W锛岀伅娉＄殑鐢甸樆R L = = =12惟锛涳紙2锛夊綋S闂悎锛孲 1 銆丼 2 鏂紑锛孯 1 鐨勬粦鐗囧湪鍙橀樆鍣ㄧ殑涓偣鏃讹紝鐏场涓庢粦鍔ㄥ彉闃诲櫒鏈澶ч樆鍊肩殑涓鍗婁覆鑱斺埖鐏场姝ｅ父鍙戝厜鈭寸數璺腑鐨勭數娴両=I L = = =0.5A婊戝姩鍙橀樆鍣ㄤ袱绔殑鐢靛帇U 婊 =U锕 L... 绛旓細瑙ｏ細锛1锛夌伅娉℃甯稿伐浣滄椂锛屼袱绔殑鐢靛帇涓篣 L =6V锛岀敱鍥2鍙緱锛岀伅娉℃甯稿伐浣滄椂閫氳繃鐏笣鐨勭數娴両 L =0.5A锛涳紙2锛夊綋S闂悎锛孲 1 銆丼 2 閮芥柇寮鏃讹紝灏忕伅娉″拰婊戝姩鍙橀樆鍣ㄤ覆鑱旓紝褰撳皬鐏场涓ょ鐨勭數鍘嬩负4V鏃讹紝鐢卞浘璞″彲鐭ョ數璺腑鐨勭數娴両=0.4A锛屾粦鍔ㄥ彉闃诲櫒鎺ュ叆鐢甸樆鐨勯樆鍊糝 婊 = = =20惟锛涳紙3锛塖 1 ... 绛旓細鐢卞浘鍙煡褰U L =6V鏃讹紝I L ="0.5A" 鎴 锛1 鍒嗭級锛2锛塖闂悎锛孲 1 銆丼 2 閮芥柇寮鏃讹紝L銆丷涓茶仈鐢卞浘鍙煡褰揢 L 鈥=4V鏃讹紝I L 鈥="0.4A" 锛2鍒嗭級锛3锛塖銆丼 1 銆丼 2 閮介棴鍚堟椂锛孯 1 銆丷骞惰仈 褰揑=0.6A鏃讹紝鐢佃矾娑堣楃殑鎬诲姛鐜囨渶澶 锛1鍒嗭級 ... 绛旓細锛1锛夌伅娉′笌婊戝姩鍙橀樆鍣ㄤ覆鑱旓紝P鍦ㄤ腑鐐规椂锛堣繛鍏ョ數闃讳负12R锛夛紝鐏场姝ｅ父鍙戝厜锛岃鏄庢鏃剁伅娉′袱绔殑鐢靛帇涓6V锛屾牴鎹覆鑱旂數璺殑鐢靛帇鐗圭偣锛屽彉闃诲櫒涓ょ鐨勭數鍘嬩负6V锛屽嵆鍙橀樆鍣ㄧ殑鏈澶ч樆鍊糝涓虹伅娉＄數闃籖L鐨勪袱鍊嶏紝RL=R鈥=12R锛庯紙2锛夊綋P绉诲姩鍒版渶鍙崇鏃讹紙鐢甸樆鍏ㄨ繛鍏ヤ负R锛夛紝I=UR+RL=PRL锛屽嵆锛12VR+12R=2W12R锛岃В... 绛旓細锛1锛夊綋P绉诲姩鍒版渶鍙崇鏃讹紙鐢甸樆鍏ㄨ繛鍏ヤ负R锛夛紝灏忕伅娉鐨勫疄闄呯數鍘嬩负4V锛岀煡閬鐢垫簮鐢靛帇12V锛鍒欐粦鍔ㄥ彉闃诲櫒涓ょ鐨勭數鍘嬩负12V-4V=8V锛屽彲瑙佸皬鐏场鐨勭數闃讳负婊戝姩鍙橀樆鍣ㄦ渶澶х數闃籖鐨12锛屽嵆RL=R鈥=12R锛庯紙2锛塒鍦ㄤ腑鐐规椂锛堟粦鍔ㄥ彉闃诲櫒杩炲叆鐢甸樆涓12R锛夛紝鐏场姝ｅ父鍙戝厜锛岃鏄庢鏃剁伅娉＄殑瀹為檯鍔熺巼绛変簬棰濈數鍔熺巼涓9W锛岃孯L... 绛旓細12V)224惟+(12V)248惟=9W锛庣瓟锛氾紙1锛夌伅娉℃甯稿伐浣滄椂閫氳繃鐏笣鐨勭數娴佷负0.5A锛涳紙2锛塖闂悎锛孲1銆丼2閮芥柇寮鏃讹紝璋冭妭婊戝姩鍙橀樆鍣紝褰撳皬鐏场涓ょ鐨鐢靛帇涓4V鏃讹紝婊戝姩鍙橀樆鍣ㄦ帴鍏ョ數闃荤殑闃诲间负20惟锛涳紙3锛塖銆丼1銆丼2閮介棴鍚堟椂锛岃皟鑺傛粦鍔ㄥ彉闃诲櫒婊戠墖鍒癰澶勬椂锛屾暣涓數璺秷鑰楃殑鎬诲姛鐜囨渶灏忎负9W锛 绛旓細褰撴粦鐗囨粦鍒版渶鍙崇鏃讹紝婊戝姩鍙橀樆鍣ㄨ繛鍏ョ數闃讳负60惟锛屾鏃剁數鍘嬭〃绀烘暟鏈灏忥紝鍒欑數璺腑鐢垫祦锛欼=UR1+R2鏈澶=12V100惟+60惟=0.075A锛岀數鍘琛ㄧ殑绀烘暟U1=I脳R1=0.075A脳100惟=7.5V锛涘綋婊戠墖婊戝埌鏈宸︾鏃讹紝婊戝姩鍙橀樆鍣ㄨ繛鍏ョ數闃讳负0锛屾鏃剁數娴佺ず鏁版渶澶э紝鍒欑數璺腑鐨勭數娴侊細I鈥=UR1=12V100惟=0.12A锛庢晠绛旀... 绛旓細褰撴粦鍔ㄥ彉闃诲櫒R鐨勬粦鐗嘝绉昏嚦涓偣鏃讹紝绛夋晥鐢佃矾鍥濡傚浘1鎵绀锛涘綋婊戠墖P绉昏嚦鏈宸︾鏃讹紝绛夋晥鐢佃矾鍥惧鍥2鎵绀猴紟鍥1涓紝鐏场姝ｅ父鍙戝厜鏃剁殑鐢靛帇UL=6V锛屸埖涓茶仈鐢佃矾涓荤數鍘嬬瓑浜庡悇鍒嗙數鍘嬩箣鍜岋紝鈭碪R=U-UL=12V-6V=6V鈭典覆鑱旂數璺腑鍚勫鐨勭數娴佺浉绛夛紝鈭存牴鎹濮嗗畾寰嬪彲寰楋細ULUR=I1RLI1脳12R=6V6V=11锛岃В寰楋細R=2R... 绛旓細鏍规嵁灏忕伅娉＄殑U-I鏇茬嚎鍙互鐪嬪嚭锛岋紝灏忕伅娉″湪6v鐨勫伐浣滅數鍘嬬殑鏃跺欙紝鐢垫祦涓0.5A 鏍规嵁绗竴棰橈紝鍙互璁＄畻鍑虹伅娉＄殑鐢甸樆r=6/0.5=12娆у锛岀劧鍚庯紝s闂悎锛屽叾浠栫殑涓や釜寮鍏虫柇寮鍚庯紝鍙湁鐏场鍜屾粦鍔ㄥ彉闃诲櫒涓茶仈锛岀幇鍦ㄧ伅娉＄殑鐢靛帇涓4v锛屽垯婊戝姩鍙橀樆鍣ㄧ殑鐢靛帇涓8v锛涓茶仈鐢佃矾涓锛岀數鍘涔嬫瘮绛変簬鐢甸樆涔嬫瘮锛屾墍浠ユ粦鍔ㄥ彉闃诲櫒鐨勭數闃... 绛旓細W=U2R1t=(12V)24惟脳600s=2.16脳104J锛庣瓟锛氾紙1锛夊綋婊戝姩鍙橀樆鍣ㄧ殑婊戠墖鍦ㄦ渶鍙崇鏃讹紝鐢垫祦琛ㄧ殑绀烘暟涓0.5A锛岀數鍘琛ㄧ殑绀烘暟涓10V锛涳紙2锛夊綋婊戝姩鍙橀樆鍣ㄧ殑婊戠墖鍦ㄦ渶鍙崇鏃讹紝R1娑堣楃殑鍔熺巼涓1W锛涳紙3锛夊綋婊戝姩鍙橀樆鍣ㄧ殑婊戠墖鍦ㄦ渶宸︾鏃讹紝閫氱數10min鏁翠釜鐢佃矾涓數娴佸仛鐨勫姛涓2.16脳104J锛 本站交流只代表网友个人观点，与本站立场无关 |
