某自动恒温箱的控制电路如图甲（a、b端所控制的加热电路未画出）．箱内电阻 R l =5kΩ， R 2 为热敏电 、（3分）如图所示电路是在环境温度为10℃左右的条件下工作的...
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(1)25 (2)15\u2103\uff5e50\u2103\u7684\u8303\u56f4\u3002(3)\u53ef\u589e\u52a0R 1 \u7684\u7535\u963b\u503c\u6216\u589e\u5927\u7535\u6e90\u7684\u7535\u538b\u3002 \uff1a\uff081\uff09\u73af\u5883\u6e29\u5ea6\u4e3a15\u2103\u65f6\u7684\u70ed\u654f\u7535\u963bR 2 \u7684\u963b\u503c\u4e3a25k\u03a9\uff1b\uff082\uff09\u5f53R 1 \u4e24\u7aef\u7535\u538b\u4e3a2V\u65f6\uff0c\u7535\u8def\u4e2d\u7535\u6d41\u4e3a\uff1bI= =0.0004A\uff0cR 2 \u4e24\u7aef\u7684\u7535\u538bU 2 =U-U 1 =12V-2V=10V\uff0c\u5219\u70ed\u654f\u7535\u963b\u7684\u963b\u503cR 2 = =25K\u03a9\u7531\u56fe2\u53ef\u5f97\uff0c\u6b64\u65f6\u6e29\u5ea6\u4e3a15\u2103\uff1b\u5f53R 1 \u4e24\u7aef\u7684\u7535\u538b\u4e3a4V\u65f6\uff0cR 2 \u4e24\u7aef\u7684\u7535\u538bU 2 \u2019=U-U 1 \u2019=12V-4V=8V\uff1b\u540c\u7406\u53ef\u5f97\u6b64\u65f6\u70ed\u654f\u7535\u963b\u7684\u963b\u503c R 2 \u2019= =10K\u03a9\u7531\u56fe2\u53ef\u5f97\u6b64\u65f6\u6e29\u5ea6\u4e3a50\u2103\u6545\u6e29\u5ea6\u7684\u53d8\u5316\u8303\u56f4\u4e3a15\u2103\u523050\u2103\uff1b\uff083\uff09\u5728\u7535\u6e90\u7535\u538b\u4e0d\u53d8\u65f6\uff0c\u628aR l \u6362\u6210\u963b\u503c\u66f4\u5927\u7684\u7535\u963b\u65f6\uff0c\u56e0U ab \u4e0d\u53d8\uff0c\u6839\u636e\u6b27\u59c6\u5b9a\u5f8b\u53ef\u77e5\uff0c\u7535\u8def\u4e2d\u7684\u7535\u6d41\u53d8\u5c0f\uff1b
| （1）0.48；20 （2）20；30 绛旓細ab闂寸殑鐢靛帇绛変簬鐢甸樆R1銆丷3鎴朢2銆丷t鐨勭數鍘嬩箣宸紝褰揜1R3=R2Rt鐢遍鎰忔湁锛歊1=20k惟銆丷2=10k惟銆丷3=40k惟锛屼唬鍏ヨВ寰楋細Rt=20k惟鏃讹紝Uab=0锛屾鏃秚=40鈩冿紟鎵浠鎭掓俯绠鍐呯殑娓╁害鍙繚鎸佸湪40鈩冿紟鏁呴夛細C 绛旓細瑙ｏ細鐢遍鎰忓緱锛氬綋Uab=0鏃讹紝鎭掓俯绠淇濇寔绋冲畾锛屾牴鎹覆骞惰仈鐢佃矾鐢靛帇涓庣數闃荤殑鍏崇郴鍙煡锛歊1锛歊2=4锛3 鍙湁 R3锛歊4涔熶负4锛3鐨勬椂鍊欙紝Uab=0锛屾鏃剁數妗ュ钩琛★紟鎵浠ュ彲鐭t鐢甸樆涓3k惟锛屼粠鍥句箼鍙互鐪嬪嚭锛岀數闃讳负3k惟鏃讹紝娓╁害涓25鎽勬皬搴︼紟鎵浠ョ瓟妗堜负锛25锛涳紴3K惟锛涳紙2锛夆憼PQ=0.1锛坱-t0锛夛紝PQ涓庢俯搴... 绛旓細A銆佺敱鍥2鍙煡锛孯2=25k惟锛鎭掓俯绠鍐呮渶浣庢俯搴鎺у埗鍦15鈩冩椂U1=2V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碦2涓ょ鐢靛帇锛歎2=U-U1=12V-2V=10V锛屸埖涓茶仈鐢佃矾涓悇澶勭殑鐢垫祦鐩哥瓑锛屸埓鏍规嵁娆у瀹氬緥鍙緱锛岀數璺腑鐨勭數娴侊細I=U1R1=U2R2锛屽嵆2VR1=10V25k惟锛岃В寰楋細R1=5k惟锛屾晠A涓嶆纭紱B銆侀檷浣庣數婧愮數鍘... 绛旓細R2=U2I鈥=8V8脳10-4A=104惟=10k惟锛岀敱鍥句箼鐭ュ綋R2=10k惟鏃讹紝瀵瑰簲鐨勬俯搴︿负50鈩冿紱鍗虫亽娓╃鍐呯殑娓╁害淇濇寔鍦15鈩冿綖50鈩冧箣闂达紟锛3锛夌敱鍒嗘瀽鐭ワ細浠庡浘涓婂彲浠ョ湅鍑猴紝鑻鎭掓俯绠辩殑娓╁害鍙樺寲闄嶄綆涓浜涳紝鍒欓渶澧炲ぇR2鐨勯樆鍊硷紝姝ゆ椂R2鍒嗗緱鐨勭數鍘嬪澶氾紱鑻ヤ繚鎸丷1涓ょ鐨勭數鍘嬪彉鍖栬寖鍥翠笉鍙橈紝鍙互鑰冭檻涓ょ鏂规硶锛氣憼鍦ㄧ數婧愮數鍘... 绛旓細Uab=R1/锛圧1+R2锛=5*12/锛5+R2锛1銆乁ab<2锛屾帴閫氾紝姝ゆ椂锛歊2>25鍗冩 2銆乁ab>4,鏂紑锛屾鏃讹細R2<10鍗冩 鏍规嵁娓╁害鍙樺寲鐨勫浘绾垮氨鍙互鍒ゆ柇鍑烘俯搴﹁寖鍥达紝鍗曚粠浣犵殑琛ㄦ牸涓婅鐨勮瘽绗竴棰樻槸25鍗冩锛岄偅娓╁害鑼冨洿鏄細15-50鎽勬皬搴 瑙傚療琛ㄦ牸鍙互鐪嬪嚭R2闃诲艰秺楂橈紝娓╁害鍙樺寲鑼冨洿瓒婂皬锛岃屼笖R1涓嶇敤鏁版嵁浠ｅ叆寰楀埌R2<... 绛旓細1) 25 锛2鍒嗭級(2)褰揢1锛2V寮濮嬪姞鐑椂锛孶2锛漊锛峌1锛12V锛2V锛10V 鐢卞浘涓彲鏌ュ緱姝ゆ椂鐨勭幆澧冩俯搴︿负15鈩冿紝姝ゅ嵆鎭掓俯绠辩殑鏈浣庢俯搴︼紱 锛2鍒嗭級褰揢1锛4V鏃讹紝U2锛漊锛峌1锛12V锛4V锛8V 鐢卞浘涓彲鏌ュ緱姝ゆ椂鐨勭幆澧冩俯搴︿负50鈩冿紝姝ゅ嵆鎭掓俯绠辩殑鏈楂樻俯搴︼紱 锛2鍒嗭級鎵浠ユ鎭掓俯绠辩殑娓╁害灏嗕繚鎸... 绛旓細涓銆(鍏16鍒)灏忔槑鍒╃敤瀹為獙瀹ょ殑鐢电缁х數鍣ㄣ佺儹鏁忕數闃籖1銆佸彲鍙樼數闃诲櫒R2绛夊櫒浠惰璁′簡涓涓鎭掓俯绠辨帶鍒剁數璺,濡傚浘1鎵绀恒傚叾涓滀氦娴佺數婧愨濇槸鎭掓俯绠卞姞鐑櫒鐨勭數婧(鍔犵儹鍣ㄥ湪鎭掓俯绠卞唴,鍥句腑鏈敾鍑);R1澶勪簬鎭掓俯绠卞唴,鍥2鏄皬鏄庨氳繃瀹為獙娴嬪緱鐨凴1鐨勯樆鍊奸殢娓╁害鍙樺寲鐨勫叧绯绘洸绾;鐢电缁х數鍣ㄧ殑鐢垫簮涓ょ鐢靛帇U = 6 V,鐢电缁х數鍣ㄧ嚎鍦堢殑... 绛旓細37. (8鍒)濡傚浘1鎵绀鐢佃矾鏄湪鐜娓╁害涓10 0C宸﹀彸鐨勬潯浠朵笅宸ヤ綔鐨鏌愯嚜鍔ㄦ亽娓╃鍘熺悊绠鍥俱 绠卞唴鐢甸樆Rl=5k惟,R2涓虹儹鏁忕數闃,鍏堕樆鍊奸殢娓╁害鍙樺寲鐨勫浘绾垮鍥2鎵绀,鐢垫簮鐢靛帇涓12V.褰撶數鍘嬮壌鍒櫒鐨勪袱鎺ュ叆鐐筧,b闂寸殑鐢靛帇Uab灏忎簬2V鏃,閴村埆鍣ㄥ皢浣垮紑鍏砈鎺ラ,浣挎亽娓╃鍐呯殑鐢电儹涓濋氱數鑰屽彂鐑,浠庤屼娇绠卞唴娓╁害鍗囬珮;褰揢ab澶т簬4V... 绛旓細涓銆侊紙鍏16鍒嗭級灏忔槑鍒╃敤瀹為獙瀹ょ殑鐢电缁х數鍣ㄣ佺儹鏁忕數闃籖1銆佸彲鍙樼數闃诲櫒R2绛夊櫒浠惰璁′簡涓涓鎭掓俯绠辨帶鍒剁數璺锛濡傚浘1鎵绀恒傚叾涓滀氦娴佺數婧愨濇槸鎭掓俯绠卞姞鐑櫒鐨勭數婧愶紙鍔犵儹鍣ㄥ湪鎭掓俯绠卞唴锛屽浘涓湭鐢诲嚭锛夛紱R1澶勪簬鎭掓俯绠卞唴锛屽浘2鏄皬鏄庨氳繃瀹為獙娴嬪緱鐨凴1鐨勯樆鍊奸殢娓╁害鍙樺寲鐨勫叧绯绘洸绾匡紱鐢电缁х數鍣ㄧ殑鐢垫簮涓ょ鐢靛帇U = 6 ... 绛旓細涓銆侊紙鍏16鍒嗭級灏忔槑鍒╃敤瀹為獙瀹ょ殑鐢电缁х數鍣ㄣ佺儹鏁忕數闃籖1銆佸彲鍙樼數闃诲櫒R2绛夊櫒浠惰璁′簡涓涓鎭掓俯绠辨帶鍒剁數璺锛濡傚浘1鎵绀恒傚叾涓滀氦娴佺數婧愨濇槸鎭掓俯绠卞姞鐑櫒鐨勭數婧愶紙鍔犵儹鍣ㄥ湪鎭掓俯绠卞唴锛屽浘涓湭鐢诲嚭锛夛紱R1澶勪簬鎭掓俯绠卞唴锛屽浘2鏄皬鏄庨氳繃瀹為獙娴嬪緱鐨凴1鐨勯樆鍊奸殢娓╁害鍙樺寲鐨勫叧绯绘洸绾匡紱鐢电缁х數鍣ㄧ殑鐢垫簮涓ょ鐢靛帇U = 6 ... 本站交流只代表网友个人观点，与本站立场无关 |
