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恒定电流 (复习) PowerPoint PPT Presentation


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恒定电流 (复习). 知识结构. 电流强度 I. 电压 U. 电阻 R. 电源电动势 E. 电功率 P. 电热 Q. 电功 W. 电阻定律. 部分电路欧姆定律. 闭合电路欧姆定律. 焦耳定律. 串联特点、性质. 并联特点、性质. 测定金属电阻率. 测定电池的电动势和内电阻. 使用多用电表. 基本概念. 基本规律. 电路连接. 实验. 电阻的串联和并联. 1. U . R. I . 电压分配. 电流分配. R. 并联. 串联. 各电阻 I 1 = I 2 = . 各支路 U 1 = U 2 = .

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恒定电流 (复习)

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6934439


6934439

I

U

R

E

P

Q

W


6934439

1

U

R

I

R

I1=I2=

U1=U2=

U=U1+U2+

I= I1+I2+

R=R1+R2+

12 (3)


6934439

1

W (Kw)


6934439

2

QI Rt

Q=I2Rt

3

1

W=Q

2


6934439

q

O

t

  • 1Rq ttg

  • AU BR

  • CU/R DR/U


  • 6934439

    • 22112

      • A11 B14

      • C18 D41


    6934439

    I

    R2

    R1

    • 3R1=1000I=0.03AR1 5mAR2


    6934439

    4220V 100w220V90%


    6934439

    5220V0.45A5

    1

    2


    6934439

    6UA 3minQB6minQ

    1ABUQmin

    2ABUQmin


    6934439

    71.00100kW400V kW10KV kW


    6934439

    R1

    R2

    U

    R

    R3

    8R1R2R3R1>R2>R3RR3 R1R2R3RP1P2P3P

    A P1>P2>P3>P B P1> P3 > P > P2

    C P1>P2>P3=P D P1> P2= P >P3

    R3


    6934439

    915V3k15V12Vk3k4V

    V


    6934439

    U

    R

    V

    10VAVBR14.7V14.3VUR

    A14.7V

    B14.7V14.3V

    C14.3V

    D


    6934439

    V

    A

    R

    11R0.93V9.5mA105000


    6934439

    Rx

    Rx

    v

    v

    mA

    mA

    U

    U

    12 5.0mA4.5V,4.0mA4.8VU


    6934439

    A

    B

    D

    C

    U

    • 13ABCD ( )

  • ACD B AC

  • CAB DAC

  • M

    N


    6934439

    10

    4

    6

    2.4V

    a

    3

    b

    • 13ab ab.


    6934439

    L

    R

    A

    C

    B

    P

    • 14ABLPBCABRBCL


    6934439

    R4

    V

    A

    R1

    R2

    R3

    r

    U

    15U=3.0Vr=0.6 , R1= R2 =R3=R4=4 ,


    6934439

    R2

    A

    E

    R1

    R3

    S

    r

    16R1=12 R2=8 R3=4SA0.50ASA0.72A


    6934439

    17ABA8.0VB5.0VB10V


    6934439

    M

    E

    R0

    R

    r

    V

    18E=10Vr=0.50R0=1.0 R= 1.5 VUV=3.0V

    1

    2 3


    6934439

    E r

    A

    R2

    V1

    V2

    R3

    C

    R1

    A1

    A2

    B

    19R1CA1A2V1V2

    AA1A2 V1V2

    B A1 A2V1V2

    C A1V1A2V2

    D A1 A2V2V1


    6934439

    a

    d

    R1

    L

    b

    c

    R2

    20LLUcd=Ubd=0Uad=6V

    AR1 B R2

    C R1 D R2


    6934439

    d

    a

    L1

    L2

    b

    c

    R

    21L1L2cd

    Aab Bad

    Cc d Dbc


    6934439

    R1

    R2

    D

    R3

    R4

    A

    B

    C

    22,R1: R2: R3: R4 = 1: 2: 3: 4,UR2,C [ ]

    A

    B

    C

    D


    6934439

    U(v)

    3

    b

    2

    a

    1

    I(A)

    0

    6

    2

    4

    23aU-IbU-I

    ( )

    A.4,33.3 B.2, 33.3

    C. 2, 67 D. 467


    6934439

    24R1R2EV12V, V23V ( )

    AE = 5 V

    BV3

    CV31V

    D

    V2

    V1

    V3

    R2

    R1


    6934439

    25Uv1/2U


    6934439

    26 R 1.3=2R2.4 R 1.2=3R2.4 R 1.4 =2R 2.4 ;R 3.4 =0

    1

    3

    2

    4


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