You know how sometimes when you’re driving, people slow down to take pictures of traffic on the other side? Capacitance is kinda like that. It works because the electrons on one side are attracted to the other side and pile up. If you make the two sides closer together, more people will take pictures. If you make the material between the two sides more transparent, more people will take pictures. And if you make the traffic flow more congested, more people will take pictures.
Similarly, you can increase the amount of electricity stuck in a capacitor by decreasing the distance between the two sides, changing the material in the middle, or using more pressure (voltage) to cram more electricity in. This is where the analogy breaks down. Since electrons don’t take up any physical space, you can always cram more of them into a capacitor by increasing the voltage. You can’t really do that with cars.
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