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AP Physics 1: 3.3 Properties of Objects and Systems 215 Views


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Description:

We can't resist a good question about resistivity. Can you?

Language:
English Language

Transcript

00:03

Here's your Shmoop du jour your brought to you by resistivity.

00:07

Resistivity is a measure of... resistance a student is comparing the resistivity of [Alarm clock electrocutes young boy]

00:13

two different metallic bars that have an equal shape and size. What would be the

00:18

best way to do so? And here's the potential answers.

00:22

(Mumbles)

00:26

All right, well if we're gonna be measuring

00:28

something it's important to use the right tool for the job, for example we

00:32

can't take someone's temperature using a bathroom scale. Uh, we tried that on our [Sick looking man goes to stand on a scale]

00:37

selves once and all we learned was that our fever was making us a little

00:41

delirious... So to compare the resistivity of two different metals we need to use

00:46

the right method and the right tool since resistivity is a measure of how

00:49

easily electric current flows through a material the only way to measure it is

00:53

by using electricity, and the best way to measure that difference in resistance

00:57

also known as the voltage drop is with a voltmeter. If you do it again it's a

01:03

revolting sorry nevermind... Alright so by a little process of elimination the

01:07

correct answer here is D, if we were trying to measure how the different

01:10

metals conduct heat then A would be the right answer and if we were trying to [Metal objects are thrown onto a fire]

01:13

see how heavy each metal is well then it'd be C and if we'd had a long day and wanted

01:18

to rage out on something well then option B would be right. Oh and you could

01:22

also determine which metal is more brittle that way too yep the right tool for the

01:26

job it's important in plumbing, car repair and physics and now we're feeling [Luigi, car mechanic and scientist appear in a toolbox]

01:30

increased resistivity to being awake so well you know, nap time... [Alarm clock jumping on young boys head]

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