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AP Physics 1 Videos 86 videos

AP Physics 1: 2.5 Changes and Conservation Law
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AP Physics 1: 2.5 Changes and Conservation Law. At what point(s) in this situation is energy lost in any form?

AP Physics 1: 1.4 Waves
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AP Physics 1: 1.4 Waves. Which of the following is technically true for Max as he stands at the edge of oblivion? 

AP Physics 1: 1.4 Changes and Conservation Laws
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AP Physics 1: 1.4 Changes and Conservation Laws. Find the current across R2.

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AP Physics 1: 2.4 Changes and Conservation Laws 172 Views


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AP Physics 1: 2.4 Changes and Conservation Laws. Which of the following circuits should the students use?

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Transcript

00:00

Thank you and here's your shmoop du jour brought to

00:05

you by electricity because without electricity this whole shmoop thing

00:08

just really wouldn't work Yeah smoke signal shmoop just doesn't

00:13

sound practical All right a group of students is tasked

00:16

with creating an experiment to illustrate the conservation of electric

00:19

charge As shown through kirchoff junction rule They're given a

00:23

simple circuit board A twenty four volt battery three resistors

00:29

and an amp meter Which of the following circuits should

00:32

the students use and hear potential answers All right Circular

00:36

d'oh cancer This we first have to be clear on

00:40

what kirchoff junction rule actually his since that's the whole

00:43

point of the question and all Well cochise junction rule

00:46

states that current is conserved through a junction so that

00:51

the amount of current that comes into a junction is

00:53

the same amount that comes out of it That's part

00:56

of the law of conservation of electrical charge in a

00:59

closed system electrical charge can't change so we can put

01:02

all the junctions we want in a circuit A total

01:06

charge coming out of all those junctions will still be

01:08

the same as what came in And if we measure

01:10

the current at any point within those junctions it'll add

01:13

up to what went in Got it We'll prove the

01:16

kirchoff wasn't just goofing around We need a circuit that

01:18

allows us to measure the current either coming into or

01:21

going out of a junction and we also need to

01:24

measure the current at all the points that are part

01:27

of the junction The diagram that allows us to do

01:30

that is answered with this circuit We can use the

01:32

meter to measure the current at the first resistor then

01:36

use it to measure the current at each branch of

01:38

the junction Then we could prove that the total current

01:41

is the same in the junction and outside of it

01:44

and old gustav kirchoff would be proven right once again

01:48

and hopefully our electric grid will keep working for a

01:50

long time But if the power goes down and smoke

01:52

signals don't work well we might just have to get 00:01:55.169 --> [endTime] our shmoop on via carrier pigeon

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