How dielectrics function in circuits. By David Santo Pietro. Created by David SantoPietro.
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This is high school grade level learning, but taught in a manner for earlier-level school. This poses the question that perhaps young children should be taught the basics about sciences, so that when they go to high school the fundamentals are already understood. Someone here commented below why go to university when such videos are available. Trust me, electronics E101 at university is so so so much more complex than this!! It would certainly have helped me to have watched this video and understood such fundamentals around 10 years old.
But isn't it increasing the charge would also mean an increase in voltage, resulting in an equivalent ratio, therefore not changing the capacitance of the capacitor since the ratio remains the same? That is according to another Khan Academy Tutor here: https://youtu.be/u-jigaMJT10?t=4m52s PLEASE CONFIRM THIS. Thank you.
I have a problem. Can you pls answer this.
The dielectric in a capacitor is changed to a material with a dielectric constant that is larger by a factor of five. If the charge on the capacitor is held fixed, by what factor does the energy stored in the capacitor change? Explain why the energy is different in the two cases.
At 5:11 how can the voltage across the plates remain the same? First it is clearly explained in the video that the voltage across the plates decreases due to the introduction of a dielectric medium. Now if a battery is connected, it will try to increase the potential across the plates to make it equal to its own voltage. In the process of doing so, both the charge and voltage of the capacitor should increase.
I believe that what is happening is that the charge is increasing until the voltage is the same and the extra charge is being occupied by the dielectric. So, the voltage remains the same even though the charge is increased.
Who knows how many atoms are in the none conducting material. But if they all move to align into + - positions in a fraction of a nano second, you would think this would cause some damage to the material. I don't believe it. I think they haven't got a clue about electricity . Try looking up, or can someone explain what dielectric actually is? I don't believe there is positive and negative electricity. Just charge or discharge. In a circuit, using a battery, at what point does the electricity travelling threw the circuit change from + to - in it's return journey to the battery?
Please Clarify :
In parallel capacitor having two dielectrics with relaive permitivity X1 and X2 and distance "D" between plates . Now voltage "V" between the plates of both capacitors is same , but electric field in both dielectrics will be different due to different dielectrics ....than how come DE1 =DE2 = V ?? ( E1 AND E2 are feild in different dielectrics) what is wrong here???
Are there any other electrical playlists with this instructor? I have been watching the Khan Academy Electrical Engineering videos but those went over my head, this guy and his diagrams are very easy to understand.
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