第十一章 第七节 探究——影响导体电阻大小的因素-2020-2021学年九年级全一册初三物理【名师学案】(北师大版)

!"#$%&'( ! !" )*)+,-./ '' !!! !\# ! *+ !!! """"""""""""""""""""""" " " " " " " " " " " " " " """""""""""""""""""""""" " " " " " " " " " " " " # ## # ]^Z_M`ab.cd !" �"(�o[�"px(J�7B " §(H{ @�"( !! QR ! & ! ¿> !! & ! cäG ! µ ��'A " � @ ¦ I ' A " P $ H ò O � " � x " �o@¦I(�3% ! ]. ! ! #" g¦I¾×½J¦Ij " !B( ! J� ! 9f � " TL [ H � = � " 4 5 ! å } æ ç 8 ! ! B " *¨H�" ! $ !"#$%& ! ±T²m¬,�° !" ! 12 " �0 # ����)Á Û # $% k &7 8v��p% µ $ hp� © + # L X M N ! JBÇ8è¼ ! # P r � ²¯p%ëÁ�)^b # §Ze>[y³t ! Tì I ! ! [\ % f�¼©y & ` % �uy &"$ §�÷6* e>Á�^b��$ ! cäG² ! )©Á $ �Á,] ���à�k &7 lÆe�)�ip%ë # GPre> �$Á�^b��$ ! QR !!! )©Á $ #" ! #*!/ " u0 # �$)Á��!"?��Ax© ! " " &" �$)cd '" �$)fg (" �$)7s )" �$BK)Á` $" ! #*!/ " £¤¥ # !"�AZ # {�$Á�^b&L ïÈ®)* ! " " &" �$*qífÁÛ '" �$BK)Á` (" LX�$)ÁÓ )" �$)7s %" �z�ië)Á�v > # ð­§zìfÁÛ)�ë Á�_b # PU®)[y* ! # " &" ab�ëBK)Á` '" ]^�ëZ)ÁÓ (" &�ë{¶+ìfÁÛ )" &�ë67+ìfÁÛ $ !"#$%) ! m¬,�°³TU,´µ -" e > � $ ) Á � � A s )©Á)g¡���� # É® Z Í Â � | n { � µ«�³ # &MNÕÁÓ ¢)�| ! 06 ! ! [\ % _ ^ &% _ b & ` % - _ &"# §�g¡¨G8 ! }�8J�é�>E& ! $ ." ! 12 " {Q # ��§WûeH¯YA!)s�$ # w��p®È ! % " &" .Á�ë '" «µ (" _�j )" Á� '''''''''''''''''''''''' ( ( ( ( ( ( ( ( ( ( ( '''''''''''''''''''''''' ' ' ' ' ' ' ' ' ' ' ' µ !! !" 7 8 J Ç / L É > ! % { ë R $ Î C ' ¾ ¿ & ÊE # »¼ # ^ËÌFÍ�E ' /L>? " #" R$'JǸ/Lm÷JK # /ÈJ@ÍL^ JM'4=½/ž¿�À " $" 5/�&R$'JÇ�cÎ�E'ËFnS4 ! &6ÏR$'JÇÎÐ�E'ËF�nT= & fÑ '" /" ! #*!/ " ¦@ # ©0�$Á�^b # !"¨y<î) * ! " " &" �$-ífÁÛ³�)Á�v´ '" �$BK)Á`¤^ # �)Á�ß�ï¤^ (" LX�$)ÁÓ¤^ # �$)Á�ß�ï¤b )" �3 � A � ï ³ # � $ ) 7 s ¤ 7 � ) Á � ß ¤^ 0" ! 12 " §¨ # �z7 !41 )�ë # Á�v > # *�� ¼��C # ,&D!)�C67Õ !41 # é³�)Á � ! % " &" ^0 > '" f0 > (" b0 > )" ��{-Y # xyz{�_ö +" ! #*!+ " TU#$ # v�Pñ�Õ�¬ # ÑC1Þß �ãǤ{C¸3)Áë�¿~=�v # �< ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( &� ,-17+*89 ./17:;< '( !!! �¿p)i�Áë-¡pzT ( Áë·'G"�¨ G§3Àï)·'ðb $ �õ§ZÁë-¡pzT )�ð��* ! " " &" Áë)As�õÁ�J^ '" Áë)cd�õÁ�J^ (" Áë)7s�õÁ�J^ )" Áë