Electri-fried Circuits - By MITK12Videos
Transcript
| 00:07 | my mom told me to always stay away from power | |
| 00:10 | lines . But whatever , look , I'm perfectly safe | |
| 00:14 | . Hey , look , there's my friend , Hey | |
| 00:17 | , what's up ? What do they seem to have | |
| 00:25 | in common ? They use electricity . And what about | |
| 00:29 | these ? That's right . Electricity People and animals use | |
| 00:34 | electricity to control our bodies . We need two things | |
| 00:38 | for electricity to flow . A voltage difference and a | |
| 00:41 | closed loop for a voltage difference . If you have | |
| 00:46 | a high voltage point and a low voltage point , | |
| 00:49 | then electricity can go between them . However , if | |
| 00:54 | there is no voltage difference , then no electricity will | |
| 00:56 | flow . Usually we achieve a voltage difference using a | |
| 01:00 | power source such as the power you get from the | |
| 01:03 | electrical outlet in your health . Other devices are powered | |
| 01:07 | by batteries Like this . Nice green laser pointer . | |
| 01:11 | If I take away its source of power , then | |
| 01:14 | it doesn't work anymore . Here's the battery , which | |
| 01:16 | looks pretty big , but if you look closely , | |
| 01:19 | it's rated for 1.5 votes the same as a regular | |
| 01:22 | double a battery . Let's connect a motor and make | |
| 01:24 | a circuit . Mhm . It spins just as we | |
| 01:30 | might expect . Look at this guy , it's a | |
| 01:32 | nine volt battery . It can provide more power . | |
| 01:35 | So when I hook up the motor , that's fine | |
| 01:38 | . A lot faster . Now , let's look at | |
| 01:40 | the second criteria for circuit . Here are some examples | |
| 01:44 | of open loops and closed loops . Electricity is always | |
| 01:48 | looking for a closed loop connecting only when another motor | |
| 01:51 | doesn't give us a closed loop . Mm . Okay | |
| 01:56 | , so what about this ? Closed loop doesn't work | |
| 01:59 | because the two wires are at the same potential electricity | |
| 02:03 | is the movement of tiny particles called electrons . No | |
| 02:06 | car is silly enough to drive to a dead end | |
| 02:09 | . Now , some will take a scenic detour . | |
| 02:12 | Can we build circuits with things other than wire ? | |
| 02:14 | Let's try it with this ribbon , nope , it | |
| 02:18 | doesn't work . We can use a multi meter to | |
| 02:21 | measure the resistance of the ribbon , which tells us | |
| 02:24 | how well it conducts electricity . The OL means that | |
| 02:28 | the resistance is too high for the meter to measure | |
| 02:33 | how about the lead from a mechanical pencil ? Wow | |
| 02:40 | , that actually worked Our handy multi meter measures a | |
| 02:43 | resistance lower than that other ribbon . Let's play around | |
| 02:47 | and test it with the shoelace , nope , and | |
| 02:52 | with a knife , a stovetop with a kick on | |
| 02:54 | it . When something has less resistance , it's like | |
| 03:00 | making the trek wider and letting more cars go around | |
| 03:05 | . Taking my pencil and drawing three rectangles of different | |
| 03:09 | sizes . Now to measure their resistance is The first | |
| 03:14 | one is about 5.6 kg Longer . one is about | |
| 03:18 | 25 . Only crowd the middle for yourself . We | |
| 03:23 | can also see that my finger has a measurable resistance | |
| 03:28 | . What about water ? This is pure de ionized | |
| 03:31 | water that you get from the lab . If we | |
| 03:33 | try to make our circuit through the water , we | |
| 03:36 | see that nothing happens . Pure water isn't a very | |
| 03:39 | good conductor . Let's jump . And a bunch of | |
| 03:43 | songs . I wouldn't drink that if I were you | |
| 03:48 | . Please don't try this without adult supervision . When | |
| 03:53 | we make the same circuit as before , tap water | |
| 03:58 | has all sorts of stuff in it . So you | |
| 04:00 | want to keep hair drives away from the bathtub is | |
| 04:02 | not only robots use electricity , but people do to | |
| 04:05 | have too much electricity goes through you , then you're | |
| 04:08 | going to have a bad time . Okay ? But | |
| 04:10 | how does this relate to the birds ? Say your | |
| 04:12 | battery's the power plant and our motor is the health | |
| 04:15 | . We'll connect them with our high voltage power line | |
| 04:17 | and our low voltage power line . We'll use the | |
| 04:22 | light to represent our bird . The bird is safe | |
| 04:27 | when only touching one wire when it touches both . | |
| 04:35 | Normally , the electricity looks around through the two wires | |
| 04:40 | . When the bird touches both wires , hey , | |
| 04:42 | look , time for a detour . What do you | |
| 04:45 | think happens with the burden on top fire ? I | |
| 04:50 | will keep this in mind the next time I hang | |
| 04:51 | on around power lines . Yeah . |
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