14.2 让电灯发光-2019-2020学年九年级全一册初三物理【名师学案】(沪科版)

!"#$%&'( ! !" )*)+ ,-./ %' !!! !(# ! `\abc ! 01234*56 ! 789:; " """"""""""""""""""""""" " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " """""""""""""""""""""""" " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " # ## # " !" Z ! L[ ! / ! Æ¿ ! # ! SÆ ! # ! ·� ! G­ ��2ièøøw5ù�q ! ú±�?2iè� " #" è�û ! Æ¿ ! üýè�è� % ! SÆD ! r è�|79]^Ë�5�Y ! ! ·� ! Z?þ �è�5­wP_à " $" +,-Ùfg $ ! ÎÆÌL�ë¢Fì� ! 9 èø5µ3 " ü× ! è��wq ! èøq)¢ ! Æ¿FÎí ! øã ! �£ö¡ # ! SÆD ! G ø� ! Æ¿FÏí ! % '" ÿÿ­w5è�¨© ! îï ! % h�ÿ_à5 è�¨© ! ðï ! % ��£Zè�Òë�/è !´;Zö¡­w5è�¨© ! ñï ! " 2! ��n ! ñï ! )"0�#$5 " (" ��|+%ãÙ&c50�Z[ " 0" %è�~q�'X $& ! ' �Z ! òbÃLFÜó ! % & # ' � ! ôõ ! # ! pö ! " $ !"# # ! ��F�� !" #Ð]A&©-^uIsÔÕ-E " ( # *" cd�Q-&©m&� ! �&× ! o&l:]£� +" &�-b�E¸�&×Þ& $ ¤Þ��-&N ," ô�\¥�&×�b-&©WEcd�Q-&© -" :]-b�E8�&©-jl3 #" ����-&©I>cdE�Q- " , # %%%%%%%%%%%%%%%%%%%%%%%% & & & & & %%%%%%%%%%%%%%%%%%%%%%%% % % % % % !! �?è,�G» ! ¥�QÐ¥�s�¥?,� = $ E¥+QDE4��¥?,�= $ ��Ð¥?, �`s�¯ù $ �¤���TE # $ !"# $ ! �� & ����� $" ���� $ �&Î-ìRE ! Î ! ¿ $ O`E ! Ï ! ¿ % Âi:]¬ $ j?J·Ý-&NR&E ! # , - ! $ j?J·Ý-«m&JZ&)*-R&E ! - , # ! % " ªHmúû & ! , " ' Á & " , ! '# '" "����-ñ ! + ! êQd&©I $ ! f ! �Ej © $ ! ª ! �E:© $ ! ÷ ! �EN© % $ !"# % ! ��j (" ! #%!) " ¹º # ����&©�I $ å�*&©/Ù -E " - # * + , - 0" �� $ EJï^æ-�*&© $ !"P&QIÏ)Ç &©-&©� % /" ��&©�^æ�*� % & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & ,-<= +*>? ./<=9@A %( !!! %%%%%%%%%%%%%%%%%%%%%%%% & & & & & & & & & & & & %%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % % % % % % !! �¥��,::L  ' !" ¥��=DEH:�;,¡¢ ! ¬£��=¡¢ # #" ¥��::�Í.s6 ! ¬@¤,��wè¥ }¦§ $ �=¡¢¬È¨$¥�©�ª $ ×�«¬ " ­ � ! -®¯) # $" °±m-�¥��K ! L@A�=¡¢4m- UM ! ¥��4m-¤Ï82:² # )" �����,,--�R $ ôºú�R¯­SI $ � ["-·l¯Lº\º& $ �RlRSTimãA cd ! ·� ! " û&©U5�Ð # æ"&©I % P ) 7~ !! P 1 7~ 1" � � � � $ ã : ] K ! ! K # Í 3 : ; $ & © E ! ðï ! ) ã : ] K !  i ! K # 3 : ; $ & © E ! îï ! ) ã:] K ! ! K # ÍÂi; $ &©E ! ñï ! % " múû & j© '& 3©