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lesson40204


    Electrostatic
  1. physics_excel_Function1
  2. physics_excel_inputfunction2 ;vector_addition
  3. physics_excel_graph3
  4. coulomb's law;F=kq1q2/R2
  5. electricfield; E=kQ/R2
  6. electric_potential;
    1. V=kQ/R
    2. W=qV=(1/2)mv2-(1/2)mu2
    3. v=sqrt(2qV/m)
  7. capacitor ; C=Q/V ;1F=1C/V
  8. capacitor ; C=eoA/d
  9. Energy_store_Capacitor(W)=(1/2)QV=(1/2)CV2
  10. Capacitor combination ;C_series=C1+C2+....
  11. Capacitor combination ;1/C_parallel=1/C1+1/C2+....
    Ohm's law
  1. R=V/I
  2. R_series=R1+R2+...
  3. 1/R_parallel=1/R1+1/R2+...
  4. non_ohm's law ;1/R=di/dV
  5. Resistivity(r ;W.m)
  6. conductivity(s ; S/m
  7. R=rL/A
  8. s=1/r
    Electromotive force;E.M.F.(E)and internal_resitance(r)
  1. QE=QVr+QVR
  2. E=V+I*r
  3. I=E/(R+r)
  4. and ;limR--->infinityI=E/(R+r)=0
  5. limR--->infinityV=ER/(R+r)=E
    Electric_Power
  1. P(W)=I(A)*V(V)=I2R=V2/R
  2. 1 unit=1 kw.hr=1000w*3600s=3.6x106J
  3. P_electric_cell=E2R/(R+r)2
  4. IF R=r ; P_electric_cell_max=E2/(4r) ;(calculus ; dP/dR=0)
  5. W=Pt
  6. Pt=mcDT
    Emw1
  1. F=+qvxB
  2. R=mv/qB
  3. DC_MOTOR
  4. Fmotor=LIxB
  5. M=IBANcosq
  6. F12=L1I1xBI2
  7. F21=L2I2xBI1
    Electromagnetic induction
  1. Einduced=-df/dt
  2. Flux_f=BANsinq
  3. dsinq/dt=+wcosq
  4. Einduced_dynamo=+wBANcosq
  5. Einduced_dynamo_max=+wBAN
  6. Fdynamo=-Fmotor=+LIinducedxB
  7. transformer ; E1/E2=N1/N2
  8. power_transformer=I1E1=I2E2
  9. Back E.M.F in D.C.motor ;start_motor ;Eback_e.m.f.=0 ;V1=I1*Rmotor
  10. D.C.motor ;steady-state;I2<I1; V2-Ebackemf=I2*Rmotor
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