Low - level code handles the actual signals , such as the generation of electrical pulses sent over an ethernet cable or through a telephone modem 低阶程式码负责操纵真实讯号，比如产生电脉冲，并把讯号传送到乙太网路的缆线或电话数据机。
Students at us massachusetts institute of technology explore piezoelectricity , the generation of power from mechanical stress such as motion in footsteps 美国麻省理工学院的学生运用压电效应原理，利用人行走时对地板所产生的压力来产生电。
Dc spark testing generates practically no corona and no heat , and is therefore a gentler test process , dc can be used on foamed insulation and thin insulation 直流火花机几乎不能产生电晕和热量?因此它是一种轻微的测试方法?直流火花机可用于发泡和薄的绝缘。
About 2 , 000 years ago , wang chong , a chinese philosopher , discovered that it one rubbed a piece of amber with a piece of fur or wood , he could always produce electricity 大约2 ， 000年前，中国的一位哲学家王充发现，如果把一块琥珀在一块兽皮上或木头上摩擦，随时都能产生电。
When olfactory neurons respond to odor molecules , they transmit chemical energy into electrical signals , which then trigger a secondary molecular messenger cascade that generates electrical impulses to the brain , signaling that it is smelling something 当嗅觉神经元对气味分子产生应答反应时，它们将化学能转变为电信号，接着，电信号触发继发的分子信使级联反应产生电脉冲将闻到某种气味的信号传至大脑。
