Catch the Mistake! Exploding Wire - By MITK12Videos
Transcript
| 00:0-1 | Let me show you something cool . Mhm . So | |
| 00:10 | what just happened here ? This power supply created a | |
| 00:14 | current , A flow of electrons traveled over here to | |
| 00:18 | a capacitor . Now , capacitors , two metal plates | |
| 00:21 | in an insulating oil charge can't flow through the oil | |
| 00:26 | from one place to another . So it builds up | |
| 00:29 | on one of the plates , charging it negatively . | |
| 00:32 | The other plate is left with a positive charge . | |
| 00:34 | This creates a potential difference . Some voltage across the | |
| 00:38 | capacitor potential difference is kind of like potential energy . | |
| 00:41 | The more charge you build up between the plates , | |
| 00:44 | the more voltage you have and the more energy you | |
| 00:46 | have stored in the capacitor . I've been charging this | |
| 00:49 | capacitor for about 20 minutes and it's charged up now | |
| 00:53 | to about 3000 volts . So that energy just sits | |
| 00:57 | there until I flip this one . When I do | |
| 01:02 | that , I'm completing a circuit where an iron wire | |
| 01:05 | connects the two plates of the capacitor . Imagine , | |
| 01:08 | just during the hoover dam , huge water flow , | |
| 01:13 | It's the same thing here . Electrons will rush from | |
| 01:16 | the negative plate through the iron wired to the positive | |
| 01:19 | plate and the wire can't handle all that current you | |
| 01:22 | might have heard about . Tom's law in physics V | |
| 01:25 | equals IR voltage equals current times resistance . Now the | |
| 01:29 | voltage in the capacitor after it's been charged up is | |
| 01:32 | going to be really high and the resistance in this | |
| 01:35 | wire is really , really small . So the current | |
| 01:37 | going through , it is going to be huge when | |
| 01:41 | current flows through anything with resistance . Even if it's | |
| 01:43 | just a little resistance energy is dissipated in the form | |
| 01:47 | of heat . The huge amount of current leads to | |
| 01:50 | a huge amount of heat that the wire can't dissipate | |
| 01:53 | . So it explodes instead . Now the wire actually | |
| 01:56 | explodes before all the charge can finish leaving the capacitor | |
| 01:59 | . So I'm going to take this copper bar and | |
| 02:02 | touch it to the two capacitor plates so it can | |
| 02:04 | finish discharging . Mhm . Okay . Now the thick | |
| 02:10 | copper bar has a way higher resistance than the thin | |
| 02:13 | iron wire , so it dissipated the energy better and | |
| 02:15 | didn't explode . |
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