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2answers
293 views
A lightning protection device physics
Here is a description of the principle of the operation of a new lightning device:
During a storm the ambient electric field may rise to
between 10 to 20 kV/m. As soon as the field exceeds
a thresold ...
6
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2answers
690 views
Lots of little questions about radiation of LC circuits
I'm trying to get a more intuitive understanding of resonant inductive coupling. It's supposed be a more efficient way to transfer electrical energy wirelessly, because the coils are only coupled by ...
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0answers
74 views
How do we deal with the intermittence of solar and wind energy? [closed]
We know that solar panels don't work at their best under cloudy skies. Wind turbines also don't turn when the wind doesn't blow. I like to imagine a 100% renewable energy portfolio (solar PV/thermal, ...
7
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2answers
329 views
Torque of an electric engine
So I have some follow up questions from this thread:
Electric engine transmission
Basically, I am looking for a more precise mathematical statement that makes this true. Why is it that the electric ...
4
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3answers
4k views
What happens when we connect a metal wire between the 2 poles of a battery?
As I remembered, at the 2 poles of a battery, positive or negative electric charges are gathered. So there'll be electric field existing within the battery. This filed is neutralized by the chemical ...
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7answers
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What is a general definition of impedance?
Impedance is a concept that shows up in any area of physics concerning waves. In transmission lines, impedance is the ratio of voltage to current. In optics, index of refraction plays a role similar ...
