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AP Physics 2: 1.5 Changes and Conservation Laws 4 Views


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Description:

AP Physics 2: 1.5 Changes and Conservation Laws. Which of the following statements is correct?

Language:
English Language

Transcript

00:03

And here's your shmoop du jour brought to you by enchanted

00:06

forest unfortunately none of the forests around us have dragon eggs or dwarves.. one [Dwarf with a dragon egg in a forest]

00:11

time we thought we found a treasure map though but it turned out to be a burger

00:14

wrapper it did lead us to a good McDonald's though. Bognor the dwarf is

00:19

foraging in the wire forest and stumbles across a dragon egg his first thought [Elf walks into a dragon egg]

00:23

is to make a dragon omelet but his kinder nature prevails he decides to

00:27

incubate the egg with a 60-watt light bulb which of the following statements

00:31

is correct, select two answers and here the choices...... oh good old Bognar sure he may

00:39

look grumpy on the outside but we know he's really happy inside yeah we're [Bognar dancing]

00:43

going to work our way through all the seven dwarves here people so we can't

00:47

let this opportunity slip by and it's nice of a Bognar to take care of this

00:51

dragon egg, although we really wouldn't want a dragon hatching in [Dragon egg hatches and dragon appears]

00:55

our place we're not big fans of flying fire hazards but if we do want to make

01:00

this future dragon warmer we need to increase the power of the bulb. Power is a

01:04

product of voltage and current so if we increase the voltage will crank up the

01:07

power and crank up the heat and we bet all that warmth is making the dragon [Dragon egg by a burning fire]

01:11

to be nice and sleepy, answer A is one of our correct choices right there if the

01:16

voltage across the bulbs increased than the current through the both remain

01:19

constant the heat emitted by the bulb will increase. Answer B says charge

01:23

carriers have zero electric potential energy at the positive terminal of the

01:27

battery but by convention charge carriers are positive which means at the [Positive carrier travelling down a road]

01:32

positive terminal charge has the maximum electrical potential energy we're not

01:37

too bashful to stand up and say B is wrong let's take a look at how power can [Person switches power button on]

01:41

be expressed.. power or watts equal current or amps times voltage or volts and

01:48

current AKA amps equals charge over time or coulombs over second so amps can be

01:55

expressed as coulombs per second and volts can be expressed as well volts so

02:01

yeah power can indeed be stated as both coulombs per second answer C gets

02:05

clean bill of health from the doc it's one of the right choices and as for

02:09

answers D well the electrons in in a current [Electrons in a current travel to negative]

02:11

are negatively charged so they are repelled from the negative end of a

02:14

battery like people are repelled from us when we get hay fever.. No one

02:18

likes us when were sneezy.. So answer D is incorrect and there you have it four

02:23

choices two correct answers and seven dwarfs wait we got all seven in their [Seven dwarfs appear]

02:28

sorry sometimes we can be dopey about this kind of thing.

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