九年级物理下册18.3电能与社会发展学案(无答案)(新版)粤教沪版.doc

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118.3 电能与社会发展 学习目标 1、了解电能输送过程。2、常识性了解我国电力事业发展状况,激发学生的爱国热情,提高节约用电意识。学习重点:了解我国电力事业发展状况。学习难点:高压输电的道理。合作探究 探究点一:我国的电力工业1、我国电网建设成就显著从农村电价大幅度下降到城网线损逐年降低,从百分之百国产化的灵宝换流站到翻山越岭的贵广直流输电工程,从东北电网“大扰动”试验到西北 750 千伏示范工程,在“十五”的五年时间里,我国的电网建设业绩辉煌。无数事实证明,经济越发达的国家电能的生产和使用规模越大;对电能的需求量越多的国家,经济越发达。 电能的优越性: (1)来源广泛 化学能,水能,风能,太阳能,原子能等都可以转化为电能。 (2)便于输送 输送远,能量损失小。 (3)使用方便 电能方便转化为机械能、内能、光能、其他能。 (4)其他方面 用电器使用效果率高、操作简单、污染小。 探究点二:节约用电家庭节约用电的几种方法:对普通老百姓家庭,要养成节电习惯,做到人走灯灭,避免“长明灯” ;随时关闭无用空转的电器;使用国家推广的节能电器;充分利用自然光等等。要掌握各种家用电器的节电方法。外出时家电不要待机。每台电器在待机状态下都需耗电。 2

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