#1
My science exam is tomorrow and I'm doing last minute studying.

My friend asked me this:

"how much energy is used by a 200 ohm resistor operating at 12v for 2 min"

I came up with the answer 400 (I don't even know in what units), but he says it's 86.4j.


Can someone who knows how to do this please explain how.

Thank you
#2
I'm on summer break so I don't have to worry!!! ................ Sorry
666 BRO
#3
Quote by Kankuro
I'm on summer break so I don't have to worry!!! ................ Sorry


Well tomorrows the last exam then I'm off.
#4
A modern day warrior
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#5
Quote by Thornography
Well tomorrows the last exam then I'm off.


Good luck then....
666 BRO
#7
well, if it helps at all you go from volts and ohms to joules lol
if those two combine to make a joule (ex. ohms/volts=joules) or w/e then maybe -shrug-
Satan isn't inside a guitar pick. He's in here. In our hearts. He's what makes us not want to go to work, or excercise or tell the truth. He's that little voice in your mind that says "Fuck you" to the people you hate.
#8
12/200=.06
E/R=I
Ohms Law
Power is P=IxE
I=.06
E=12
P=.72 watts
Does your answer need to be in joules (your friends ans) or in watt/hrs.
I will leave the rest to you
Jam on
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#9
Hopefully you get a Formulae sheet on your exam so you can basically just plug in numbers. I have a science provincial exam on tuesday..
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#10
Quote by Jackal58
12/200=.06
E/R=I
Ohms Law
Power is P=IxE
I=.06
E=12
P=.72 watts
Does your answer need to be in joules (your friends ans) or in watt/hrs.
I will leave the rest to you
Jam on


Thanks man, I'll try to understand what you did.
#11
Quote by Thornography
My science exam is tomorrow and I'm doing last minute studying.

My friend asked me this:

"how much energy is used by a 200 ohm resistor operating at 12v for 2 min"

I came up with the answer 400 (I don't even know in what units), but he says it's 86.4j.


Can someone who knows how to do this please explain how.

Thank you

I=V/R=12/200= 0.06A P=VxI=12x0.06=0.72W E=PxT=0.72x 120= 86.4 joules

Heh, I also have my science final tomorrow
GREAT ODIN'S RAVEN
#13
Quote by lemon
I=V/R=12/200= 0.06A P=VxI=12x0.06=0.72W E=PxT=0.72x 120= 86.4 joules

Heh, I also have my science final tomorrow


sir you have given a better explanation then a 30 year old science book congrats.
#14
Quote by TONY strat
where does E= p x t come from?


He is using E as = to energy or joules
P = power in watts
T = time (usually seconds)
Quote by SomeoneYouKnew
You should be careful what you say. Some asshole will probably sig it.

Quote by Axelfox
Yup, a girl went up to me in my fursuit one time.

Quote by Xiaoxi
I can fap to this. Keep going.
#15
Quote by Jimmyyoung
A modern day warrior
Mean, mean stride
Today's Tom Sawyer
Mean, mean pride!!

DUn-Duh duh DAHHH!
Dun duh duh DAHHHHH!!...


+1