headlight problem
Senior User
Joined: Apr 2000
Posts: 170
Likes: 0
headlight problem
>Just got to
>have a little fun every
>now and again.
>
I'm all for having a little fun, but hey, let's not ride them EE's too hard and then put 'em away wet. I know some of us, uhh I mean them, actually don't mind getting their plastic pocket protectors greasy.
About the resistance and current post above, current decreases with increasing resistance. The formula is current equals voltage divided by resistance. Like with other things, it's something you can forget if you don't use it every day. If you ever need it and can't call it up, just think about the extremes--an open circuit with infinite resistance and a dead short which has very near zero. Which allows more current?
Dan Blackwell
>have a little fun every
>now and again.
>
I'm all for having a little fun, but hey, let's not ride them EE's too hard and then put 'em away wet. I know some of us, uhh I mean them, actually don't mind getting their plastic pocket protectors greasy.
About the resistance and current post above, current decreases with increasing resistance. The formula is current equals voltage divided by resistance. Like with other things, it's something you can forget if you don't use it every day. If you ever need it and can't call it up, just think about the extremes--an open circuit with infinite resistance and a dead short which has very near zero. Which allows more current?
Dan Blackwell
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
headlight problem
Dan, My first born has a EE from NCSU, I got all of my degrees from UHN cumalonglater. :-)
Dr. John
jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01] My FTE Page
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners] NC Ford Truck owners group
66F100s Rule
In the cool still quite of night you can hear chevies rusting away.
Dr. John
jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01] My FTE Page
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners] NC Ford Truck owners group
66F100s Rule
In the cool still quite of night you can hear chevies rusting away.
Posting Guru
Joined: Jun 1999
Posts: 2,415
Likes: 3
From: Comox Valley, Canada
headlight problem
>About the resistance and current post
>above, current decreases with increasing
>resistance. The formula is
>current equals voltage divided by
>resistance. Like with other
>things, it's something you can
>forget if you don't use
>it every day. If you
>ever need it and can't
>call it up, just think
>about the extremes--an open circuit
>with infinite resistance and a
>dead short which has very
>near zero. Which allows
>more current?
Hey neat it looks like I screwed up Ohm's Law, I hope my Boss doesnt read this
I think I was probably thinking about parallel circuitry, (the more resistors the more the total current in the circuit).
At least that is what I hope I was thinking Few to many "wobbley pop" during the hockey game and then trying to explain electricity
I stand corrected.
The beleive the rest of the post is good. The circuit breaker is tripping and resetting due to excess current draw, or a bad/worn/weak breaker.
Sparky
>above, current decreases with increasing
>resistance. The formula is
>current equals voltage divided by
>resistance. Like with other
>things, it's something you can
>forget if you don't use
>it every day. If you
>ever need it and can't
>call it up, just think
>about the extremes--an open circuit
>with infinite resistance and a
>dead short which has very
>near zero. Which allows
>more current?
Hey neat it looks like I screwed up Ohm's Law, I hope my Boss doesnt read this
I think I was probably thinking about parallel circuitry, (the more resistors the more the total current in the circuit).At least that is what I hope I was thinking
Few to many "wobbley pop" during the hockey game and then trying to explain electricity I stand corrected.
The beleive the rest of the post is good. The circuit breaker is tripping and resetting due to excess current draw, or a bad/worn/weak breaker.
Sparky
Senior User
Joined: Apr 2000
Posts: 240
Likes: 0
From: Ozarks
headlight problem
>About the resistance and current post
>above, current decreases with increasing
>resistance. The formula is
>current equals voltage divided by
>resistance.
Most of the time
But don't forget, a light bulb filament is nonlinear. The cold ("off") resistance can be quite low compared to the hot (lit) resistance. Check a standard home 100 watt bulb sometime with an ohmmeter (you'd expect it to be 120v * 0.83 amp = 100 W, thus 144 ohms). It'll be only about 9-10 ohms!
So bulbs that have the voltage reduced due to bad connections may not drop the current as much as you might expect, and can continue to heat the bad connection quite a bit.
-Charles
(a former EE, among other things
>above, current decreases with increasing
>resistance. The formula is
>current equals voltage divided by
>resistance.
Most of the time
But don't forget, a light bulb filament is nonlinear. The cold ("off") resistance can be quite low compared to the hot (lit) resistance. Check a standard home 100 watt bulb sometime with an ohmmeter (you'd expect it to be 120v * 0.83 amp = 100 W, thus 144 ohms). It'll be only about 9-10 ohms!
So bulbs that have the voltage reduced due to bad connections may not drop the current as much as you might expect, and can continue to heat the bad connection quite a bit.
-Charles
(a former EE, among other things
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