为什么电的用途这么广泛呢?因为电可以长距离传输,而且它可以很容易的转化为其它形式的能量.比如.一台马达可以把电能转化为机械能.电灯可以把电能转化为光能.电用起来是那么方便.有一个开关,你就可以很轻松的通电断电.当开关开着的时候,电路是闭合的,就通电.开关关的时候,电路是断开的,电就无法通过.
英语翻译Why is electricity so widely used?It is because electric
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