2020高考物理名师练习卷:专题十一《交变电流》含答案 - 百度文库

1.·ʾͼ 2.ûõĵ繦Ƕ

3.·õѹѹԭȦ

20ͼʾΪһѹ,dΪȦһͷ,ԭȦҽѹͼ ͼʾ.ֻceһRce?400?ĵ,ֻdeһ

Rde?225?ĵ,µĵĹʾΪ80W.

1.дԭȦѹ˲ʱֵuabıʽ;

2.ֻceһRce?400?ĵʱ,ԭȦеĵI1; 3.cedeȦıֵ

nce. ndeԼ

1𰸼 𰸣B

Aɼͼ֪t=0ʱ̴ͨȦλãǴֱA

Bt=0.01sʱ̣ͨ㣬ʱȦųƽУӦ綯󣬴ͨյı

ʴ󣬹Bȷ

Ct=0.02sʱ̣ͨ󣬸Ӧ綯Ϊ㣬C Dɼͼ֪綯ƵͼӦΪͼ󣬵D

ѡB

2𰸼 𰸣C

߱ĻƬPϻʱСȦԭȦҲ

ʾ󣬹R1ѹԭȦѹС䣬ȦѹСʵѹʾСABCȷ߱ĻƬPϻʱСȦR2ֵ䣬ʹʱ󣬹D󣻹ѡC

3𰸼 𰸣BC

ϵĵ,A,Bȷ;ĵĹ

,Cȷ,D

4𰸼 𰸣CD

,ѹΪѹU,˵ԭȦѹΪ9U,ѹΪU֪ԭȦ֮Ϊ9:1:A B. ԭȦ֮Ϊ9:1,Ia?12??Ib?Ic??Ib.Bȷ n9C. С˵ĵѹȣԸݹʽP=UIɵߵĵ繦֮Ϊ2:9C

D. ߶⣬ѹȣaƺbƵĵΪ2:9ŷķɿ֪ǵĵ֮Ϊ9:2D

5𰸼 𰸣C

ֻϿS2.Ȧеѹ.·ܵӣܵСȦʼСѹ빦ʵ.ԭ^빦ʼС.ѡA󣻴ͼпɿýѹֵΪ202V,Ϊ0.02 s,ݽĵ綯ʱı仯

e?Em sin??t?EmsinUn2at?202sin(100?t)V.ѡ B 1?1

U2n2T1U2?U1?4VS1ӵ2ȦĵѹȻ.ݽ

52U2P2?PR??1.6W.ԭȦ˹P1?P2?1.6W,ѡCȷ.D.

R

6𰸼 𰸣D

ͼȦĽṹ֪,ԭȦӦΪn1,ȦӦΪ

n2,n1?n2,ԭȦ˵ĵѹΪU,ɱѹıѹɿ֪

nU?1,U?U2,U2n2ɵ·ṹ֪,U1?U,һU1?U2,U2ܴU1,A;ԭȦ͸ȦĵֱΪI1I2,U?U1?I1r,Ȧ˵ĵѹ

U2?n2nUnnU?2(U1?I1r),ȦеĵI2?2?2(U1?I1r),I2?1I1,n1n1Rn1Rn2ɵI1?nr?nR2122U1R,ͷMʱNתĹ,Ȧn2

,I1,U?U1?I1r,ԭȦ˵ĵѹС,ΪȦn22U2n2,ʸȦ˵ĵѹU2?Uһ,ʵRĵĹP?

n1Rһ,BC,Dȷ

7𰸼 𰸣A

ݵЧӦɵýֵͨRһTǣ

Q?(I12T1122T)R?I2R?I12RT?I2RTAȷBCD

22422

8𰸼

𰸣B

ѹȦ˵ĵѹU2?5V,

U1n110??,֪ԭȦ˵ĵѹU2n2152T,Bȷ;U1?50V,ֵΪ502V,A;Um?NBS??502V,֪B?߿˲,߿еĵ綯Ϊ0,߿ֱʱ,߿еĵ綯Ϊ

502V,C;ѹP?2P=1W,D

9𰸼 𰸣AD

12ʱ,ֱ,ȶͨ,ͨ.L1,L2.Aȷ;ش12ȶ״̬ͻȻϿ,L1L2CLܹɻ·,ڵҪŵ,ȦԻ綯ƶԵ谭,L1Ϩ,Dȷ,C;34 ʱ,Ƶȶ,п,ݿС,L1䰵,L2,B.

10𰸼 𰸣A

Aûһѹû˵ĵѹU2U1I1?U2I2ãU2?I1U1Aȷ I2BûĵĹΪP?U1I1B C뽵ѹѹ빦ΪI1U1C

DϵĹʧΪP

11𰸼 𰸣A

?U?U1??r2D

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