1832年,也就是迈克尔·法拉第发现磁场变化会产生电场的那一年,一位年轻的法国工程师为一种新的、效率更高的水车申请了专利。
In 1832, the year of Michael Faraday's discovery that a changing magnetic field produces an electric field, a young French engineer patented a new and more efficient waterwheel.
Plessey将EPIC电位集成电路描述成一个本质上非常敏感的非接触式数字电压表,它可以测量到电场中的毫伏变化。
Plessey describes EPIC as essentially a very sensitive, contactless digital voltmeter capable of measuring millivolt changes in electric fields.
他同时认识到,变化电场强度将会产生一个变化的磁场,甚至在一个没有移动电子的空间中也是如此。
He also realised that varying the strength of an electric field would generate a changing magnetic field, even in empty space with no moving electric charges to speak of.
So, instead of having the periodic variation of water, or the periodic variation of air density here we're talking about an electric field.
不像水或者空气密度的,周期变化,我们这里,讨论的是电场。
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