涔?勾绾х???腑???妯℃?璇??涓??妗?В??/p>

棰??

涓??濉?┖棰?/p>

浜?????棰?/p>

涓??澶?」???

???璁＄?棰?/p>

?诲?

寰??

璇??浜杭/p>

寰??

涓??濉?┖棰?/p>

锛??绌猴? ????憋? ???

1???涓??????ㄧ?婧?????????佃矾涓?娇?ㄦ?锛??????????0???濡??灏??L璺???患i>R涓茶?????板?涓??婧??锛???患i>R10绉???垫????36??????锛???剁???????  3.6   ???锛?i>R_L锛?i>R锛?

2????????场涓茶??ュ??靛?涓?????璺?腑锛????????涓杭i>P_{?布/sub>锛????????涓杭i>P涔?/sub>锛????????涔??骞惰??ュ?????佃矾涓???????????涓杭u>            ??}

璇??浜杭/p>

寰??

浜?????棰?/p>

锛??绌猴? ????憋? ???

3???涓???靛?甯??姝ｇ?锛????????寮??涓??搴???ㄥ?涓?釜???缂?????瀵间????楠???ㄧ??????????楠???ㄧ?绠?????瑙??灏???充?瀵间???甫?垫??碉?涓?????娉??纭?????    锛?/p>

A. ????藉甫璐??          B.????藉甫姝ｇ?

C. ???甯???垫?涓?甫?郸nbsp;   D.???甯???垫?涓?甫??

4???涓??娉＄????涓?????PZ220???100??/st1:chmetcnv>锛??瀹ゆ俯涓??浼??娉??寰?????涓???讳负R₁锛???ㄦ?甯稿伐浣?????浼??娉??寰?????涓???讳负R₂=48.4娆э????R₂姣?i>R₁澶П0??互涓??杩???变?锛?nbsp;   锛?/p>

A. ???娆℃?寰???诲?蹇???????nbsp;        

B.???娆℃?寰???诲??????/p>

C.瀵瑰ぇ澶??瀵间??ヨ?锛?俯搴??楂???甸?瓒?ぇ锛??涓??浜??绉??浣?/p>

D.涓??浠??瀵间?锛????俯搴??楂???昏?澶?

5???涓?釜1.5娆х??甸?涓??涓???靛?涓茶?????扮????7浼???垫?涓??瑕??浣跨??靛?娑????????8??????涓??婧??缁???靛????娴???芥?锛?nbsp;   锛?/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???讹?????靛???负25????ュ???i>L涓??涓???患i>R涓茶?????ュ????璺???讹???i>L娑????????涓罕6???璁剧?涓???讳????????甸?娑???????????    锛?/p>

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

璇??浜杭/p>

寰??

涓??澶?」???

锛??绌猴? ????憋? ???

7????敬??ず?佃矾锛??婧????浼?????????甸?R₁=20娆э?褰???秤???????靛?琛énbsp;  ??nbsp;  ??ず?颁?姣??1锛?锛?nbsp;  ??nbsp;  ??ず?颁?姣??5锛?锛??涓???ゆ?姝ｇ‘???锛?nbsp;   锛?/p>

A.  R₂=20娆Еnbsp;   B. R₃=30娆Еnbsp;   C.?垫?琛énbsp;  ??ず?颁负0.1瀹?D.?佃矾涓??????诲???负0.8??/p>

璇??浜杭/p>

寰??

???璁＄?棰?/p>

锛??绌猴? ????憋? ???

8??????????安20V???婧??浣跨??讹????涓罕00W锛?????杩?釜?垫?杩???垮?绾匡????杩????娇???瀹?????涓焊1W锛??瀵肩嚎涓??????靛????

9??/p>

濡??

1??ず???璺???垫??靛?淇??涓??锛??寮??S????讹??垫?琛ㄧ?绀烘???.5瀹??寮?????????靛?琛ㄧ?绀烘???浼???甸?R₂??????0.2???????剁?娴??绀烘??????

10??/p>

???瀹?????

4.8浼??灏??娉″?瀹???甸?R骞惰??ㄦ?涓??璺?腑锛??娉℃?甯稿????骞茶矾涓???垫???.2瀹???ユ?瀹?滑涓茶??ㄥ?涓??璺?腑锛????场?????????瀹??瀹?????1锛?锛???跺??肩??患i>R娑??????????.24????????场???瀹?????澶?????

11??/p>

濡??

3??ず锛?i>R₁=10娆э?R₂???澶х??诲?涓撼0娆э??垫??靛??间负8浼??姹???诲?R₂杩???佃矾????讳负澶?ぇ?讹?R₂涓??????靛????澶э???ぇ涓哄?灏??

???绛??

涓??濉?┖棰?/p>

1??nbsp;[瑙ｆ?]

    姝ら?????佃矾?舵?涓轰袱涓???朵????L?存??ュ??垫?涓ょ?锛????????涓捍0W???姝ょ????????圭?P_L=U ²锛?i>R_L=40W???浜????i>L??i>R涓茶?????ュ????璺???甸?R?????负P_R=W_R锛?i>t=36J锛?0S=3.6W锛??P_R=I²R=(U锛?R锛?i>R_L))²?患i>R=3.6W锛??涓ょ??舵?????圭?姹??P_L锛?i>P_R=(R锛?i>R_L)²锛?i>R?患i>R_L=40W锛?.6W锛??姹??R_L锛?i>R=9锛???i>R_L锛?i>R=1锛?锛??棰????????涓茶??佃矾涓?i>P_L?诧?P_R=R_L锛?i>R=9锛?锛??P_L?步9P_R=9?3.6W=32.4W???纭??妗?负??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???佃矾涓???层?涔?袱?????????涓杭i>P_{?布/sub>??i>P涔?/sub>锛?i>P?布/sub>=U²/R?布/sub>锛?sub>锛?????涓ょ?骞惰??ㄧ?璺?腑锛?i>P?布/sub>?步U²锛?i>R?布/sub>???浠ゼ/p>}

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

?醇sub>??/p>

浜?????棰?/p>

3??nbsp;[瑙ｆ?]

楠???ㄧ?绠?????瑙??灏????????姝ｇ??峰?灏?????灞??涓??姝ｇ??峰?????剧?杩??瀵间????绉???峰?寮??缁?????璇存?瀵间???????甯???电?锛??浣?甫璐??????界????濡??瀵间?涓?甫?碉????甯???电???????锛??浜???垫?搴??瀵间????绔???虹?寮???佃????璐???凤?杩??浼???板?绉???封?????佃?锛??绉??搴???蜂?浼????????姝ｇ??锋??稿?浣??锛?娇绠??涓??姝ｇ??峰?灏????互瀹?????妗??锛?甫璐?????甯???藉??姐?姝ｇ‘绛??涓好??

4??nbsp;[瑙ｆ?]姝ら??????????楠?????姝ｈ?锛?富瑕??璁╁????杩??瑙ｇ?涓??涓???′欢锛?俯搴??涓???甸??间??????繁瀛??瀵瑰奖???浣???诲ぇ灏??绱????В???浣???荤?澶у?璺??浣???垮害????㈢Н?????互??俯搴???筹?澶ч????浣???甸??奸?娓╁害???楂??澧?ぇ锛?釜???澶?????娉℃?甯稿???????????患sub>娆э???场涓?????????甸?寰??锛??浠ユ?纭??璇存?????

5??nbsp;[瑙ｆ?]

???灏???靛?娑?????P???涓焊????舵??????i>U???杩??娴?i>I???韬???患i>R????ワ??ㄧ??ㄦ?涓?.5娆х??甸?涓茶??ǚ浼??婧?????????ㄧ??ㄧ??垫????涓??璺?腑???娴?????I₁=I₂锛??锛?В寰???靛?????诲???负R=2娆у?R=1.125娆э?浠ｅ?????垫?寮哄害????藉?涓杭i>I=2瀹??I=2.67瀹??姝ｇ‘??」涓毫????

6??nbsp;[瑙ｆ?]

姝ら???负涓ょ??佃矾?舵?锛????i>L?存??ュ??垫?涓ょ?锛?i>P_L=25W锛???舵?????烘?绋?i>P_L=U ²锛?i>R_L=25W锛????i>L涓???患i>R涓茶?????板??佃矾涓????i>L涓ょ??靛?涓杭i>U₂锛???舵?????烘?绋?sub>锛??姝や??圭?姹??锛?/p>

锛??U锛?i>U_L=5锛?,U_L锛?i>U_R=4锛?锛????????寮??U_L锛?i>U_R=R_L锛?i>R=4锛?锛??涓茶??佃矾涓??P_L锛?i>P_R=R_L锛?i>R=4锛?锛??P_R=4W???纭??妗?负B??

涓??澶?」???

7??CD

???璁＄?棰?/p>

8??nbsp;[瑙ｆ?]

????靛?U=220V?剁????P=100W锛????负?剁??靛?涓杭i>U?诧?涓??娉＄??讳?????规?P=U²锛?i>R锛??锛?i>P锛?i>P?步U₂锛?i>U₁锛??浠ゼ/p>

????讹???场涓ょ??????i>U_{??/sub>=I??/sub>R??/sub>=484惟?9/22=198V????讹????瀵肩嚎涓???靛?涓猴?U瀵技/sub>=U锛?i>U??/sub>=220V锛?98V=22V???瀵肩嚎涓??????靛????P瀵技/sub>锛?i>P?步IU瀵技/sub>锛?i>IU?诧???场???绾考i>I?稿?锛??P瀵技/sub>=22V?81W锛?98V=9W???瀵肩嚎涓????????涓汗???}

9??nbsp;[瑙ｆ?]

姝ら???负涓ょ??佃矾?舵?锛??涓??褰???秤????讹?R₂琚???ㄧ?璺??R₁?茬??ユ??垫?涓ょ?锛??璺?腑???娴?负0.5瀹???辨??舵?????圭?I₁=U锛?i>R₁=0.5A???寮??S??????R₁??i>R₂涓茶?涓虹?浜???佃矾?舵?锛???朵??硅〃娴??R₁涓ょ??靛?U₁=4V????患i>R₂?????i>P₂涓罕.2????辩?浜???舵?涓??娴??绛?????寰??绋??I₂=U₁锛?i>R₁??i>I₂=P₂锛?U锛?i>U₁)锛??4V锛?i>R₁=1.2W锛?U锛?V)???绗?????浜????????绋??绔??瑙ｅ?R₁=20惟??唬?ゼi>I₂=U₁锛?i>R₁=4V锛?0惟=0.2A???纭??妗?负??.2???

10??nbsp;[瑙ｆ?]

?规?P=I²R

锛??

?卞苟???璺?sub>??/p>

?变覆???璺??娴??绛?sub>?〖/p>

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

11??nbsp;[瑙ｆ?]

璁炯i>R₂杩???佃矾涓???甸?涓杭i>R_x?讹??舵?????靛????澶т负P锛????i>P=I²R???

P=I²R_x=(U锛?R_x锛?i>R₁))²?患i>R_x锛?sub>锛?????瀛???圭?锛??瀹???规?锛??=b²锛?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??????娆℃?绋?sub>锛??涓杭i>R_x瀛??涓??姝ｆ?锛??浠モ?=(20P锛?4)²锛??P?100P?グ锛?В涓??寮??P?ケ.6?????互R₂娑?????澶х????涓罕.6???灏?i>P=1.6??唬?ュ??圭???互姹??R_x=10惟??/p>