1()..

W=qU U,I, t q=I t2:

W I U t 3(J) (kWh).1kWh3.6106JW=IUt2:1().

1. P IU3(W) (kW)1kW103W

:. :. :.:.

? 1:.

2:(1) Q=W=IUtU=IR(2):1:.

QIR t : Q=I2R t2:3(J) (kWh).

1:.P I R 3(W) (kW)

: QI2Rt WIUt=I=U/R: +WWQIUt I2RtIU/R! !

: : + QI2Rt WIUt=I=U/R = :W=IUt = =I2RtU2t/R=P = I U = U2/R = I2R =P WW QIUt I2RtIU/RW= IUtQ=I2RtP = IUP=I2R=Q

Q: . Q=I2Rt J QI R t W (). W=IUt J 1kWh=3.6106JPP=W/t=IU W kW PP=Q/t=I2R W kW: ==: >>

1( )

()()CD

2 ( )

30.4 220V5A?:PPP: PP+P:: P I2R : PIU: PPPIUI2R: WPt=(IUI2R)t =(5220-520.4) 60J =6.5104J

:: IUt = I2Rt +W: W=(IU-I2R)t =(5220-520.4) 60 J =6.5104 J30.4 220V5A?

: ==: >>

1 .. 2,.

1220V800W110V?200W

2R1=2R=3R=6UP1P2P3 P1P2P3( )A236B632 C123D321A

3R1=2R=3R=6UP1P2P3 P1P2P3( )A236B632 C123D321D

4R1=6R2=3R3=4_________126

5100 4W0.2A;20V

61004W508W150 150_________ 0.2A;30V;6W

7L1L2110V60W110V100WR220VB

P=UI P=I2R C

8UPr( ) AP BU2/r C CP2r/U2 DP-P2r/U2

::4 - 5

R=60.50.2A,22.5V,4.5W