图所示电路中，已知R1＝20Ω，R2＝5Ω，a，b两端的等效电阻R为 如下图，已知R1=5Ω,R2=10Ω,R3=R4=20Ω。试...
\u56fe\u6240\u793a\u7535\u8def\u4e2d\uff0c\u5df2\u77e5R1\uff1dR2\uff1d20\u03a9\uff0ca\uff0cb\u4e24\u7aef\u7684\u7b49\u6548\u7535\u963bR\u4e3aRab=-4\u6b27
\u7ed9\u4e2a\u7b80\u5355\u7684\u7b49\u6548\u7535\u8def\u56fe\uff0cR2\u662f\u6700\u4e0a\u9762\u7684\u7535\u963b\uff0c\u5c06ab\u4e24\u7aef\u7ffb\u8f6c\uff0c\u5982\u4e0a\u56fe\uff1a
\u7b54\u6848\uff1aRab=13.33\u6b27
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ab\u95f4\u76f8\u5f53\u4e8eR1\u3001R3\u3001R4\u4e09\u4e2a\u5e76\u8054\uff0c\u5e76\u8054\u4e4b\u540e\u4e0eR2\u4e32\u8054\uff0c\u6545\u603b\u7535\u963b\u4e3a\uff1a
R1\u3001R3\u3001R4\u4e09\u4e2a\u5e76\u8054\u7684\u603b\u7535\u963b\u4e3a\uff1a
1/R\u5e76\uff1d1/5\uff0b1/20\uff0b1/20
\u5373\uff1aR\u5e76\uff1d10/3\u6b27
Rab\uff1d10\uff0b10/3\uff1d40/3\u224813.33\u6b27
绛旓細C 鏍规嵁棰樻剰锛孯1鍜孯4涓茶仈鍚庯紙40惟锛変笌R3骞惰仈锛屽彲寰楃數闃诲间负24惟锛鍐嶄笌R2銆丷5涓茶仈 鎬荤數闃诲间负 104 惟锛岃屾荤數鍘嬩负104V锛岄偅涔堝苟鑱鐢佃矾涓ょ鐨勭數鍘嬪氨鏄24V 鎵浠1涓婄殑鐢垫祦=24/40=0.6A D 浠嶤鐨勫垎鏋愬彲鐭3涓ょ鐨勭數鍘=24V 閭ｄ箞R3鐨勭數娴=24/60=0.4A ...
绛旓細1.鐢佃矾涓鐨勭數娴侊細I=U1/R1=8V/20娆=0.4A锛2.R2涓ょ鐢靛帇U2=I*R2=12V;3.澶栫數璺殑璺鐢靛帇U=U1+U2=20V 4.R1娑堣楃殑鐢靛姛鐜嘝1=U1*I=3.2W 5.R2娑堣楃殑鐢靛姛鐜嘝2=U2*I=4.8W 6.澶栫數璺秷鑰楃殑鐢靛姛鐜嘝=P1+P2=8W === 杩欑闂锛屼緷娆¤冭檻锛氱數娴佺數鍘嬬數鍔熺巼 ...
绛旓細1銆佺數鍘嬭〃鐨勭ず鏁4V锛屾槸鍙充晶铏氱嚎妗嗗唴鎬荤數闃荤殑绔數鍘 2銆佺數娴佽〃鐨勭ず鏁0.1A锛屾槸鍙充晶铏氱嚎妗嗗唴鎬荤數闃荤殑鐢垫祦 3銆佸彸渚ц櫄绾挎鍐呮荤數闃伙細R=U/I=4/0.1=40娆 4銆丷鐨勭粍鎴愶細鐢 R2=5娆э紝R4=15娆э紝R5=20娆 涓茶仈缁勬垚銆俁=R2+R4+R5=5+15+20=40娆 ...
绛旓細A銆佽嫢ab绔姞140V鐨勭數鍘嬫椂锛岀數璺腑R1銆丷3銆丷4涓茶仈锛宑d绔殑鐢靛帇绛変簬R3涓ょ鐨勭數鍘嬶紝鍒橴cd=14020+60+40脳60=70V锛涙晠AB閿欒锛汣銆佽嫢cd绔姞鐢靛帇144V锛涙鏃禦2銆丷3銆丷5涓茶仈锛宎b闂寸殑鐢靛帇涓篟3涓ょ鐨勭數鍘嬶紝Uab=14440+60+44脳60=60V锛涙晠C閿欒锛孌姝ｇ‘锛涙晠閫夛細D锛
绛旓細娌″浘锛屾牴鎹悊瑙ｇ畝绛旓細浼拌鏄數婧愬拰涓ょ數闃诲苟鑱鐢佃矾锛鏈変笁绉嶆儏鍐点1銆佽鐢垫祦琛ㄦ祴鐨勬槸R1涓數娴侊紝鍒欑數婧愮數鍘婾=0.3*20=6v锛屾祦杩嘡2鐨勭數娴佹槸6/30=0.2A锛岀數璺鎬荤數闃绘槸30*20/(30+20)=600/50=12惟銆2銆佽鐢垫祦琛ㄦ祴鐨勬槸R2涓數娴侊紝鍒欑數婧愮數鍘婾=0.3*30=9v锛屾祦杩嘡1鐨勭數娴佹槸9/20=0.45A锛岀數璺...
绛旓細棣栧厛R2鍜孯3骞惰仈,绛夋晥鐢甸樆涓篟7=R2R3/(R2+R3)=30*15/(30+15)惟=10惟 鐒跺悗R7涓R1涓茶仈,绛夋晥鐢甸樆涓篟8=R1+R7=30惟 鐒跺悗R8涓嶳4,R5骞惰仈,绛夋晥鐢甸樆涓篟9 1/R9=1/R4+1/R5+1/R8=(1/25+1/100+1/30)惟 鎵浠9=12惟 鏈鍚嶳9鍐嶄笌R6涓茶仈,鎬荤數闃籖=R6+R9=20惟 鐢垫簮杈撳嚭鍔熺巼P=E鐨勫钩鏂/R=2.4...
绛旓細R2/(R1+R2)锛歊3/(R1+R3)=5锛6 鎵浠 锛圧1+R3锛夛細锛圧1+R2)=5:4 鎵浠2锛20惟锛R3锛30惟
绛旓細褰撳紑鍏砈鎺ヨЕ鐐1鏃 UR2/(R1+R2)=5V 褰撳紑鍏砈鎺ヨЕ鐐2鏃 UR3/(R1+R3)=6V R2/R3=2/3 R2=20 R3=30 U=10
绛旓細,褰撴粦鍔ㄥ彉闃诲櫒鐨勬粦鐗嘝浣嶄簬涓偣鏃,鐢靛帇琛ㄧ殑绀烘暟涓4.5V<\/p><\/li>4.5=I*(R2\/2)<\/p><\/li>I=E\/(R1+(R2\/2))<\/p><\/li>褰揚鍦ㄧ數闃诲櫒鐨勫彸绔椂锛岀數鍘嬭〃鐨勭ず鏁颁负6V<\/p><\/li>6=I'*R2<\/p>I'=E\/(R1+R2)<\/p><\/p><\/li><\/p><\/li>E=<\/p><\...
绛旓細鐢辩數璺浘鍙煡锛孯1涓嶳2骞惰仈锛岀數娴佽〃A1娴嬪共璺數娴侊紝鐢垫祦琛ˋ2娴婻2鏀矾鐨勭數娴侊紟锛1锛夆埖骞惰仈鐢佃矾涓骞茶矾鐢垫祦绛変簬鍚勬敮璺數娴佷箣鍜岋紝鈭撮氳繃R1鐨勭數娴侊細I1=I-I2=1.5A-0.6A=0.9A锛屸埖骞惰仈鐢佃矾涓悇鏀矾涓ょ鐨勭數鍘嬬浉绛夛紝鈭存牴鎹濮嗗畾寰嬪彲寰楋紝鐢垫簮鐨勭數鍘嬶細U=I1R1=0.9A脳20惟=18V锛涳紙2锛夌數闃籖2鐨勯樆鍊硷細R2=...
