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涔?勾綰х???腑???妯℃?璇??涓??妗?В??/p>

棰??

涓??濉?┖棰?/p>

浜?????棰?/p>

涓??澶?」???

???璁＄?棰?/p>

?誨?

寰??

璇??浜杭/p>

寰??

涓??濉?┖棰?/p>

錛??絀猴? ????憋? ???

1???涓??????ㄧ?婧?????????佃礬涓?嬌?ㄦ?錛??????????0???濡??灝??L璺???患i>R涓茶?????板?涓??婧??錛???患i>R10縐???墊????36??????錛???剁???????  3.6   ???錛?i>R_L錛?i>R錛?

2????????場涓茶??ュ??靛?涓?????璺?腑錛????????涓杭i>P_{?布/sub>錛????????涓杭i>P涔?/sub>錛????????涔??騫惰??ュ?????佃礬涓???????????涓杭u>            ??}

璇??浜杭/p>

寰??

浜?????棰?/p>

錛??絀猴? ????憋? ???

3???涓???靛?甯??姝ｇ?錛????????寮??涓??搴???ㄥ?涓?釜???緙?????瀵間????楠???ㄧ??????????楠???ㄧ?綆?????瑙??灝???充?瀵間???甫?墊??碉?涓?????娉??紜?????    錛?/p>

A. ????藉甫璐??          B.????藉甫姝ｇ?

C. ???甯???墊?涓?甫?鄲nbsp;   D.???甯???墊?涓?甫??

4???涓??娉＄????涓?????PZ220???100??/st1:chmetcnv>錛??瀹ゆ俯涓??浼??娉??寰?????涓???諱負R₁錛???ㄦ?甯稿伐浣?????浼??娉??寰?????涓???諱負R₂=48.4嬈э????R₂姣?i>R₁澶П0??互涓??榪???變?錛?nbsp;   錛?/p>

A. ???嬈℃?寰???誨?蹇???????nbsp;        

B.???嬈℃?寰???誨??????/p>

C.瀵瑰ぇ澶??瀵間??ヨ?錛?俯搴??楂???甸?瓚?ぇ錛??涓??浜??縐??浣?/p>

D.涓??浠??瀵間?錛????俯搴??楂???昏?澶?

5???涓?釜1.5嬈х??甸?涓??涓???靛?涓茶?????扮????7浼???墊?涓??瑕??浣跨??靛?娑????????8??????涓??婧??緇???靛????嫻???芥?錛?nbsp;   錛?/p>

   A. 2瀹?nbsp;   B. 3.5瀹?nbsp;   C. 2.67瀹?nbsp;   D. 2.31瀹?

6?????i>L?ュ??靛?涓杭i>U???璺???訛?????靛???負25????ュ???i>L涓??涓???患i>R涓茶?????ュ????璺???訛???i>L娑????????涓罕6???璁劇?涓???諱????????甸?娑???????????    錛?/p>

    A. 2?Ζnbsp;   B. 4?Ζnbsp;   C. 8?Ζnbsp;   D. 9??

璇??浜杭/p>

寰??

涓??澶?」???

錛??絀猴? ????憋? ???

7????敬??ず?佃礬錛??婧????浼?????????甸?R₁=20嬈э?褰???秤???????靛?琛énbsp;  ??nbsp;  ??ず?頒?姣??1錛?錛?nbsp;  ??nbsp;  ??ず?頒?姣??5錛?錛??涓???ゆ?姝ｇ‘???錛?nbsp;   錛?/p>

A.  R₂=20嬈Еnbsp;   B. R₃=30嬈Еnbsp;   C.?墊?琛énbsp;  ??ず?頒負0.1瀹?D.?佃礬涓??????誨???負0.8??/p>

璇??浜杭/p>

寰??

???璁＄?棰?/p>

錛??絀猴? ????憋? ???

8??????????安20V???婧??浣跨??訛????涓罕00W錛?????榪?釜?墊?榪???垮?綰匡????榪????嬌???瀹?????涓焊1W錛??瀵肩嚎涓??????靛????

9??/p>

濡??

1??ず???璺???墊??靛?淇??涓??錛??寮??S????訛??墊?琛ㄧ?紺烘???.5瀹??寮?????????靛?琛ㄧ?紺烘???浼???甸?R₂??????0.2???????剁?嫻??紺烘??????

10??/p>

???瀹?????

4.8浼??灝??娉″?瀹???甸?R騫惰??ㄦ?涓??璺?腑錛??娉℃?甯稿????騫茶礬涓???墊???.2瀹???ユ?瀹?滑涓茶??ㄥ?涓??璺?腑錛????場?????????瀹??瀹?????1錛?錛???跺??肩??患i>R娑??????????.24????????場???瀹?????澶?????

11??/p>

濡??

3??ず錛?i>R₁=10嬈э?R₂???澶х??誨?涓撼0嬈э??墊??靛??間負8浼??姹???誨?R₂榪???佃礬????諱負澶?ぇ?訛?R₂涓??????靛????澶э???ぇ涓哄?灝??

???絳??

涓??濉?┖棰?/p>

1??nbsp;[瑙ｆ?]

    姝ら?????佃礬?舵?涓轟袱涓???朵????L?存??ュ??墊?涓ょ?錛????????涓捍0W???姝ょ????????圭?P_L=U ²錛?i>R_L=40W???浜????i>L??i>R涓茶?????ュ????璺???甸?R?????負P_R=W_R錛?i>t=36J錛?0S=3.6W錛??P_R=I²R=(U錛?R錛?i>R_L))²?患i>R=3.6W錛??涓ょ??舵?????圭?姹??P_L錛?i>P_R=(R錛?i>R_L)²錛?i>R?患i>R_L=40W錛?.6W錛??姹??R_L錛?i>R=9錛???i>R_L錛?i>R=1錛?錛??棰????????涓茶??佃礬涓?i>P_L?詫?P_R=R_L錛?i>R=9錛?錛??P_L?步9P_R=9?3.6W=32.4W???紜??妗?負??st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="32.4" UnitName="?? w:st="on">32.4??/st1:chmetcnv>??

2??nbsp;[瑙ｆ?]

褰?袱??覆????ョ????瀹???佃礬涓???層?涔?袱?????????涓杭i>P_{?布/sub>??i>P涔?/sub>錛?i>P?布/sub>=U²/R?布/sub>錛?sub>錛?????涓ょ?騫惰??ㄧ?璺?腑錛?i>P?布/sub>?步U²錛?i>R?布/sub>???浠ゼ/p>}

P_{?布/sub>?詫?P?布/sub>=U²錛?i>R?布/sub>梅U?布/sub>²錛?i>R?布/sub>=(U錛?i>U?布/sub>)²=錛?/p>}

?醇sub>??/p>

浜?????棰?/p>

3??nbsp;[瑙ｆ?]

楠???ㄧ?綆?????瑙??灝????????姝ｇ??峰?灝?????灞??涓??姝ｇ??峰?????劇?榪??瀵間????縐???峰?寮??緇?????璇存?瀵間???????甯???電?錛??浣?甫璐??????界????濡??瀵間?涓?甫?碉????甯???電???????錛??浜???墊?搴??瀵間????绔???虹?寮???佃????璐???鳳?榪??浼???板?縐???封?????佃?錛??縐??搴???蜂?浼????????姝ｇ??鋒??稿?浣??錛?嬌綆??涓??姝ｇ??峰?灝????互瀹?????妗??錛?甫璐?????甯???藉??姐?姝ｇ‘絳??涓好??

4??nbsp;[瑙ｆ?]姝ら??????????楠?????姝ｈ?錛?富瑕??璁╁????榪??瑙ｇ?涓??涓???′歡錛?俯搴??涓???甸??間??????繁瀛??瀵瑰獎???浣???誨ぇ灝??绱????В???浣???葷?澶у?璺??浣???垮害????㈢Н?????互??俯搴???籌?澶ч????浣???甸??奸?娓╁害???楂??澧?ぇ錛?釜???澶?????娉℃?甯稿???????????患sub>嬈э???場涓?????????甸?寰??錛??浠ユ?紜??璇存?????

5??nbsp;[瑙ｆ?]

???灝???靛?娑?????P???涓焊????舵??????i>U???榪??嫻?i>I???韜???患i>R????ワ??ㄧ??ㄦ?涓?.5嬈х??甸?涓茶??ǚ浼??婧?????????ㄧ??ㄧ??墊????涓??璺?腑???嫻?????I₁=I₂錛??錛?В寰???靛?????誨???負R=2嬈у?R=1.125嬈э?浠ｅ?????墊?寮哄害????藉?涓杭i>I=2瀹??I=2.67瀹??姝ｇ‘??」涓毫????

6??nbsp;[瑙ｆ?]

姝ら???負涓ょ??佃礬?舵?錛????i>L?存??ュ??墊?涓ょ?錛?i>P_L=25W錛???舵?????烘?紼?i>P_L=U ²錛?i>R_L=25W錛????i>L涓???患i>R涓茶?????板??佃礬涓????i>L涓ょ??靛?涓杭i>U₂錛???舵?????烘?紼?sub>錛??姝や??圭?姹??錛?/p>

錛??U錛?i>U_L=5錛?,U_L錛?i>U_R=4錛?錛????????寮??U_L錛?i>U_R=R_L錛?i>R=4錛?錛??涓茶??佃礬涓??P_L錛?i>P_R=R_L錛?i>R=4錛?錛??P_R=4W???紜??妗?負B??

涓??澶?」???

7??CD

???璁＄?棰?/p>

8??nbsp;[瑙ｆ?]

????靛?U=220V?剁????P=100W錛????負?剁??靛?涓杭i>U?詫?涓??娉＄??諱?????規?P=U²錛?i>R錛??錛?i>P錛?i>P?步U₂錛?i>U₁錛??浠ゼ/p>

????訛???場涓ょ??????i>U_{??/sub>=I??/sub>R??/sub>=484惟?9/22=198V????訛????瀵肩嚎涓???靛?涓猴?U瀵技/sub>=U錛?i>U??/sub>=220V錛?98V=22V???瀵肩嚎涓??????靛????P瀵技/sub>錛?i>P?步IU瀵技/sub>錛?i>IU?詫???場???綰考i>I?稿?錛??P瀵技/sub>=22V?81W錛?98V=9W???瀵肩嚎涓????????涓汗???}

9??nbsp;[瑙ｆ?]

姝ら???負涓ょ??佃礬?舵?錛??涓??褰???秤????訛?R₂琚???ㄧ?璺??R₁?茬??ユ??墊?涓ょ?錛??璺?腑???嫻?負0.5瀹???辨??舵?????圭?I₁=U錛?i>R₁=0.5A???寮??S??????R₁??i>R₂涓茶?涓虹?浜???佃礬?舵?錛???朵??硅〃嫻??R₁涓ょ??靛?U₁=4V????患i>R₂?????i>P₂涓罕.2????辯?浜???舵?涓??嫻??絳?????寰??紼??I₂=U₁錛?i>R₁??i>I₂=P₂錛?U錛?i>U₁)錛??4V錛?i>R₁=1.2W錛?U錛?V)???絎?????浜????????紼??绔??瑙ｅ?R₁=20惟??唬?ゼi>I₂=U₁錛?i>R₁=4V錛?0惟=0.2A???紜??妗?負??.2???

10??nbsp;[瑙ｆ?]

?規?P=I²R

錛??

?卞茍???璺?sub>??/p>

?變覆???璺??嫻??絳?sub>?〖/p>

????????В寰??I=0.4A錛?i>P_L=U?患i>I₁=1.92W.

11??nbsp;[瑙ｆ?]

璁炯i>R₂榪???佃礬涓???甸?涓杭i>R_x?訛??舵?????靛????澶т負P錛????i>P=I²R???

P=I²R_x=(U錛?R_x錛?i>R₁))²?患i>R_x錛?sub>錛?????瀛???圭?錛??瀹???規?錛??=b²錛?st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="4" UnitName="ac" w:st="on">4ac?グ姹?В???涓???寸?涓哄?浜?i>R_x??????嬈℃?紼?sub>錛??涓杭i>R_x瀛??涓??姝ｆ?錛??浠モ?=(20P錛?4)²錛??P?100P?グ錛?В涓??寮??P?ケ.6?????互R₂娑?????澶х????涓罕.6???灝?i>P=1.6??唬?ュ??圭???互姹??R_x=10惟??/p>