How dielectrics function in circuits. By David Santo Pietro. Created by David SantoPietro.
Watch the next lesson: https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnets-magnetic/v/introduction-to-magnetism?utm_source=YT&utm_medium=Desc&utm_campaign=physics
Missed the previous lesson? https://www.khanacademy.org/science/physics/circuits-topic/circuits-with-capacitors/v/capacitors-parallel?utm_source=YT&utm_medium=Desc&utm_campaign=physics
Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channel/UC0oGarQW2lE5PxhGoQAKV7Q?sub_confirmation=1
Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
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???
Antidepressants are medications that can help relieve symptoms of depression, social anxiety disorder, anxiety disorders, seasonal affective disorder, and dysthymia, or mild chronic depression, as well as other conditions.
They aim to correct chemical imbalances of neurotransmitters in the brain that are believed to be responsible for changes in mood and behavior.
Depression Medications (Antidepressants)
These are the most commonly prescribed type of antidepressant.
Serotonin and noradrenaline reuptake inhibitors (SNRIs) are used to treat major depression, mood disorders, and possibly but less commonly attention deficit hyperactivity disorder (ADHD), obsessive-compulsive disorder (OCD), anxiety disorders, menopausal symptoms, fibromyalgia, and chronic neuropathic pain.
SNRIs raise levels of serotonin and norepinephrine, two neurotransmitters in the brain that play a key role in stabilizing mood.
Selective serotonin reuptake inhibitors (SSRIs) are the most commonly prescribed antidepressants. They are effective in treating depression, and they have fewer side effects than the other antidepressants.
SSRIs block the reuptake, or absorption, of serotonin in the brain. This makes it easier for the brain cells to receive and send messages, resulting in better and more stable moods.
They are called "selective" because they mainly seem to affect serotonin, and not the other neurotransmitters.