When a brief pulse of electricity is sent to the read/write head it flips on a tiny electromagnet for a fraction of a second.
当一个简单的电脉冲被送到读写头,它会短时间内出现一个小的电磁。
It's like electricity, you know, like the feeling of seeing that many people in the stadium
就像电流一样,那种在体育场看到超多人的感觉,
There are many kinds of work. There's electrical work, take the motor, you plug it into the wall, electricity makes the fan go around, that's electrical work. There's magnetic work.
我们复习一下大一,学过的功的概念:,物体在力的作用下,运动了一段距离。
In fact, until we do electricity and magnetism the next semester, everything's going to be based on just the laws of Newton.
其实,在下学期学习电磁学之前,所有的内容都是基于牛顿定律的
If you will buy stock in an electrical utility which has a guaranteed revenue stream, because no matter how bad the economy gets, a lot of people still use electricity, you don't expect it to fluctuate a lot.
如果你在有着,保障性年收入的电气供应股票投资,因为不管经济变得怎么查,人们还得用电,它不会降多少。
It turns out the electrical potential or electricity that you can measure on the surface of the body reflects things that are happening deeper inside like the beating of your heart.
人们已经证明在体表测量得到的电势能,或者电信号,能够表征,像心跳这样,身体较深处的变化
So, you have a bunch of people willing to supply electricity
那么,有一些人愿意提供电力
If you look at the electrical force, the force of electricity, proton and electron or something, it's not proportional to the mass of either object.
如果你考察电作用力,即电现象产生的力,质子啊,电子啊,或者其它什么东西,这种力不和物体的质量成比例
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