SC a battery

K

Ken O

Guest
hello

Here is another basic questions.I would to know why does a battery create
sparks when you take a wire and touch the negative of a battery with the
positive.?
Also why is it said there are no current?
V = I * R is the basic formula, with a negligable resistance in the wire and
lets say a 12 volt fully charge car battery. With no resistance, there can
be no current?
but if there is no current, why is there sparks. The voltage in this case is
only a potential.

thanks
ken
 
"Ken O" <lerameur101@Ya.com> wrote in message
news:dgIzd.10786$Tn1.192252@news20.bellglobal.com...
hello

Here is another basic questions.I would to know why does a battery create
sparks when you take a wire and touch the negative of a battery with the
positive.?
Also why is it said there are no current?
Click to expand...
Only YOU said there is no cuurent. Any learned person will agree that
there is indeed some current to create sparks. And if you do that on the
terminals of a car battery you may also create an explosion. Then you
may become the recipient of a Darwin award.


V = I * R is the basic formula, with a negligable resistance in the wire
and
lets say a 12 volt fully charge car battery. With no resistance, there
can
be no current?
but if there is no current, why is there sparks. The voltage in this case
is
only a potential.

thanks
ken
Click to expand...
 
"Ken O" <lerameur101@Ya.com> wrote in message
news:dgIzd.10786$Tn1.192252@news20.bellglobal.com...
hello

Here is another basic questions.I would to know why does a battery
create
sparks when you take a wire and touch the negative of a battery with
the
positive.?
Also why is it said there are no current?
V = I * R is the basic formula, with a negligable resistance in the
wire and
lets say a 12 volt fully charge car battery. With no resistance,
there can
be no current?
but if there is no current, why is there sparks. The voltage in this
case is
only a potential.
Click to expand...
There is indeed current. You just need to rearrange your formula to V/R
= I to find the amount of current. Since you are basically dividing by
zero (R), the value of I is infinite not zero.
 
On Sun, 26 Dec 2004 19:00:16 -0700, "Ken O" <lerameur101@Ya.com>
wrote:

hello

Here is another basic questions.I would to know why does a battery create
sparks when you take a wire and touch the negative of a battery with the
positive.?
Also why is it said there are no current?
Click to expand...
Says who?

V = I * R is the basic formula, with a negligable resistance in the wire and
lets say a 12 volt fully charge car battery. With no resistance, there can
be no current?
Click to expand...
No. With a very low resistance, you will have a very large current -
turning the Ohm's Law equation around to solve for current, you get I
= E/R. For a 12 volt battery, and a foot of #12 wire (1.65 ohms/1000
ft), you get I = 12/.00165 = 7273 amps!!

but if there is no current, why is there sparks. The voltage in this case is
only a potential.
Click to expand...
There is Lotsa current, therefore Lotsa sparks.

thanks
ken
Click to expand...
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
 
So why does it create sparks?? and not when you put a resistor or a small
load.
I guess when the positive meet negative, the holes and electron join
together, why should there be sparks ?
Is there en electron overload? if so how and why
Click to expand...
Sparks are caused by heat (incandescence). Hot metal gives off light and so
does hot, ionized gas.
 
Ken,

I'm not sure I totally understand your question but there can only be
sparks or arcs if there is current flow. It comes from the inductance
in the wire which when the current is interrupted by making an breaking
the connection generates very high voltages, enough to cause arcing
much like what occurs in a relay.

Tom, P.E.
 
"Anthony Fremont" <spam@anywhere.com> wrote in message
news:HZJzd.7617$wD4.2652@fe1.texas.rr.com...
"Ken O" <lerameur101@Ya.com> wrote in message
news:dgIzd.10786$Tn1.192252@news20.bellglobal.com...
hello

Here is another basic questions.I would to know why does a battery
create
sparks when you take a wire and touch the negative of a battery with
the
positive.?
Also why is it said there are no current?
V = I * R is the basic formula, with a negligable resistance in the
wire and
lets say a 12 volt fully charge car battery. With no resistance,
there can
be no current?
but if there is no current, why is there sparks. The voltage in this
case is
only a potential.

There is indeed current. You just need to rearrange your formula to V/R
= I to find the amount of current. Since you are basically dividing by
zero (R), the value of I is infinite not zero.
Click to expand...
So why does it create sparks?? and not when you put a resistor or a small
load.
I guess when the positive meet negative, the holes and electron join
together, why should there be sparks ?
Is there en electron overload? if so how and why

Ken
 
On Sun, 26 Dec 2004 22:58:14 -0700, "Ken O" <lerameur101@Ya.com>
wrote:


No. With a very low resistance, you will have a very large current -
turning the Ohm's Law equation around to solve for current, you get I
= E/R. For a 12 volt battery, and a foot of #12 wire (1.65 ohms/1000
ft), you get I = 12/.00165 = 7273 amps!!

but if there is no current, why is there sparks. The voltage in this case
is
only a potential.

There is Lotsa current, therefore Lotsa sparks.

Ok so what you are saying is the battery is able to give it off but not
able to receive it at the same rate!
Click to expand...
No, I didn't say that. The current is the same at all points in a
series circuit.

When you touch the wire to the battery terminal, you briefly make a
very small-area connection. The battery tries to force a large
current through that connection, so the wire at that point heats to
incandescence. Also, if you jiggle the wire to make and break the
connection, the current will try to keep flowing after you break the
connection, making a small arc.

So the internal resistance of the battery is therefore much higher then the
wire,
correct?
Click to expand...
Well, the battery does have some internal resistance, but I don't
think we can make any estimate of its value from this experiment.

Ken
Click to expand...
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
 
"Peter Bennett" <peterbb@somewhere.invalid> wrote in message
news:ubrus0tci5nfr1h880utim137eqnpvsr69@news.supernews.com...
On Sun, 26 Dec 2004 19:00:16 -0700, "Ken O" <lerameur101@Ya.com
wrote:

hello

Here is another basic questions.I would to know why does a battery create
sparks when you take a wire and touch the negative of a battery with the
positive.?
Also why is it said there are no current?

Says who?

V = I * R is the basic formula, with a negligable resistance in the wire
and
lets say a 12 volt fully charge car battery. With no resistance, there
can
be no current?

No. With a very low resistance, you will have a very large current -
turning the Ohm's Law equation around to solve for current, you get I
= E/R. For a 12 volt battery, and a foot of #12 wire (1.65 ohms/1000
ft), you get I = 12/.00165 = 7273 amps!!

but if there is no current, why is there sparks. The voltage in this case
is
only a potential.

There is Lotsa current, therefore Lotsa sparks.
Click to expand...
Ok so what you are saying is the battery is able to give it off but not
able to receive it at the same rate!
So the internal resistance of the battery is therefore much higher then the
wire,
correct?

Ken
 
"Ken O" <lerameur101@Ya.com> wrote in message
news:jLLzd.11651$Tn1.243473@news20.bellglobal.com...
"Peter Bennett" <peterbb@somewhere.invalid> wrote in message
news:ubrus0tci5nfr1h880utim137eqnpvsr69@news.supernews.com...
On Sun, 26 Dec 2004 19:00:16 -0700, "Ken O" <lerameur101@Ya.com
wrote:

hello

Here is another basic questions.I would to know why does a battery
create
sparks when you take a wire and touch the negative of a battery with
the
positive.?
Also why is it said there are no current?

Says who?

V = I * R is the basic formula, with a negligable resistance in the
wire and
lets say a 12 volt fully charge car battery. With no resistance,
there can
be no current?

No. With a very low resistance, you will have a very large current -
turning the Ohm's Law equation around to solve for current, you get I
= E/R. For a 12 volt battery, and a foot of #12 wire (1.65 ohms/1000
ft), you get I = 12/.00165 = 7273 amps!!

but if there is no current, why is there sparks. The voltage in this
case is
only a potential.

There is Lotsa current, therefore Lotsa sparks.

Ok so what you are saying is the battery is able to give it off but
not able to receive it at the same rate!
So the internal resistance of the battery is therefore much higher
then the wire,
correct?

Ken
This may be sci.electronics.misc but your question should be in
Click to expand...
sci.electronics.basics and in fact it so basic that you should either
read a lot or go to http://www.ibiblio.org/obp/electricCircuits/ and
study quite a lot then you could understand some answers to relatively
simple questions.
--
John G

Wot's Your Real Problem?
 
"John G" <Greentest@ozemail.com.au> wrote in message
news:prPzd.108$A33.5611@nnrp1.ozemail.com.au...
"Ken O" <lerameur101@Ya.com> wrote in message
news:jLLzd.11651$Tn1.243473@news20.bellglobal.com...

"Peter Bennett" <peterbb@somewhere.invalid> wrote in message
news:ubrus0tci5nfr1h880utim137eqnpvsr69@news.supernews.com...
On Sun, 26 Dec 2004 19:00:16 -0700, "Ken O" <lerameur101@Ya.com
wrote:

hello

Here is another basic questions.I would to know why does a battery
create
sparks when you take a wire and touch the negative of a battery with the
positive.?
Also why is it said there are no current?

Says who?

V = I * R is the basic formula, with a negligable resistance in the wire
and
lets say a 12 volt fully charge car battery. With no resistance, there
can
be no current?

No. With a very low resistance, you will have a very large current -
turning the Ohm's Law equation around to solve for current, you get I
= E/R. For a 12 volt battery, and a foot of #12 wire (1.65 ohms/1000
ft), you get I = 12/.00165 = 7273 amps!!

but if there is no current, why is there sparks. The voltage in this
case is
only a potential.

There is Lotsa current, therefore Lotsa sparks.

Ok so what you are saying is the battery is able to give it off but not
able to receive it at the same rate!
So the internal resistance of the battery is therefore much higher then
the wire,
correct?

Ken
This may be sci.electronics.misc but your question should be in
sci.electronics.basics and in fact it so basic that you should either read
a lot or go to http://www.ibiblio.org/obp/electricCircuits/ and study
quite a lot then you could understand some answers to relatively
Click to expand...

Thanks for the web site
ken
 
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