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1) Ohm's law says that J is proportional to E...but is this E the E field created by the battery, or something else? Because when this expression is manipulated to get V=IR, this V is said to be the voltage drop caused by the resistor, which would seem to suggest that the E is not the electric field due to the battery. But then what is it?
2) When a current passes through a resistor, the electrons lose energy. Wouldn't this mean that, due to the reduced kinetic energy of the electrons, they would travel less quickly and thus the current intensity would drop? Why does the current stay the same? —Preceding unsigned comment added by 173.179.59.66 ( talk) 02:59, 20 January 2010 (UTC)
Ah okay...but if the V manifests in something abstract like a change in potential energy, then how is a voltmeter able to measure it? —Preceding unsigned comment added by 173.179.59.66 ( talk) 12:24, 20 January 2010 (UTC)
Wait let me guess, does the E field create a magnetic field which is then measured? —Preceding unsigned comment added by 173.179.59.66 ( talk) 12:28, 20 January 2010 (UTC)
And what happens in the space between resistors? Let's say two resistors are connected in series. Then there is a V drop through the first resistor, and another V drop through the second resistor, but between the two resistors the voltage doesn't change (or negligibly so). I would guess that this implies that the E field is practically 0 in this area...so how does E field created by the battery dissapear here? Do the charges like rearrange to create a 0 E field? —Preceding unsigned comment added by 173.179.59.66 ( talk) 12:37, 20 January 2010 (UTC)
Was a study ever done suggesting what might have happened had the leak in Challenger's SRB field joint been directed outward instead of toward the ET?
Chapter III: The Accident of the Rogers Commission Report details the timeline of events, with flame from the leak first visible at at +60s. During the next four or five seconds, before the LH2 tank was breached, the craft's control system started to react to the forces caused by the plume and the reduced right booster chamber pressure. The spacecraft broke apart at +72s, but both boosters continued to burn until they were detonated by the RSO at +110s, only 10 seconds before normal burnout. Was there any chance that the Challenger could have survived had the flame plume not been directed at the ET? 124.157.247.221 ( talk) 06:25, 20 January 2010 (UTC)
← While O-ring erosion and evidence of blow-by on previous missions certainly indicated the problem that led to the STS-51-L loss, the effects on flight dynamics cannot be compared. Whereas the worse previous case, STS-51-C, had resulted in "unprecedented penetration of the primary O-Ring and heavily charred effects on the secondary O-Ring" in the center field joint of the right SRB, the aft field joint of the right SRB of STS-51-L, which was recovered from the debris, showed a 27 in. x 15 in. hole burned through the SRB casing. ( photo) While wondering if the vehicle could had survived had the flames not been directed onto the ET could be regarded as idle curiosity, such a question would seem to influence future probabilistic risk assessment. That is, would any such burn through necessarily result in the loss of vehicle? 124.157.247.221 ( talk) 23:20, 20 January 2010 (UTC)
Hello you nice Pythias. Please excuse my poor English, I'm French.
I already asked this question in the French equivalent of your reference desk called the Oracle but I got poor answers.
Introduction : very often, speaking of the melting of the antartic cap (I know it's a continent, but there's ice on and around the continent), specialists speak of the western part of the Antartic.
Question : This western makes a sense for me for Europe, Africa and every where else in the world except Artic and Antartic.
What does it mean for the Antartic ?
Thak you very much for your explainations. Joël DESHAIES - Rheims in France - -- 90.7.206.69 ( talk) 14:24, 20 January 2010 (UTC)
We have West Antarctica. The French ref desk is called the Oracle? Over here we are explicitly not a crystal ball. I think that excludes all forms of divination. 81.131.36.119 ( talk) 14:31, 20 January 2010 (UTC)
Thanks. -- ✶ ♏ ݣ 15:17, 20 January 2010 (UTC)
Does a solid burn or does it change state to a gas first ? Purple pete2000 ( talk) 19:37, 20 January 2010 (UTC)
I don't think there is a single latitude or longitude consisting either completely of land or completely of water. But which latitudes and longitudes come the closest? JIP | Talk 19:51, 20 January 2010 (UTC)
I'm curious, does anyone have statistics on the distribution of ages at which people experience their first sexual intercourse? For example, (pulling numbers out of the air) perhaps 10% of people lose their virginity at age 15, 15% at age 16, 15% at age 17, and so on... I sometimes see claims about the average age at which people give up their virginity, but such reports almost never present much real data. I'm wondering if people know of any detailed data sets. Dragons flight ( talk) 21:28, 20 January 2010 (UTC)
Science desk | ||
---|---|---|
< January 19 | << Dec | January | Feb >> | January 21 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
1) Ohm's law says that J is proportional to E...but is this E the E field created by the battery, or something else? Because when this expression is manipulated to get V=IR, this V is said to be the voltage drop caused by the resistor, which would seem to suggest that the E is not the electric field due to the battery. But then what is it?
2) When a current passes through a resistor, the electrons lose energy. Wouldn't this mean that, due to the reduced kinetic energy of the electrons, they would travel less quickly and thus the current intensity would drop? Why does the current stay the same? —Preceding unsigned comment added by 173.179.59.66 ( talk) 02:59, 20 January 2010 (UTC)
Ah okay...but if the V manifests in something abstract like a change in potential energy, then how is a voltmeter able to measure it? —Preceding unsigned comment added by 173.179.59.66 ( talk) 12:24, 20 January 2010 (UTC)
Wait let me guess, does the E field create a magnetic field which is then measured? —Preceding unsigned comment added by 173.179.59.66 ( talk) 12:28, 20 January 2010 (UTC)
And what happens in the space between resistors? Let's say two resistors are connected in series. Then there is a V drop through the first resistor, and another V drop through the second resistor, but between the two resistors the voltage doesn't change (or negligibly so). I would guess that this implies that the E field is practically 0 in this area...so how does E field created by the battery dissapear here? Do the charges like rearrange to create a 0 E field? —Preceding unsigned comment added by 173.179.59.66 ( talk) 12:37, 20 January 2010 (UTC)
Was a study ever done suggesting what might have happened had the leak in Challenger's SRB field joint been directed outward instead of toward the ET?
Chapter III: The Accident of the Rogers Commission Report details the timeline of events, with flame from the leak first visible at at +60s. During the next four or five seconds, before the LH2 tank was breached, the craft's control system started to react to the forces caused by the plume and the reduced right booster chamber pressure. The spacecraft broke apart at +72s, but both boosters continued to burn until they were detonated by the RSO at +110s, only 10 seconds before normal burnout. Was there any chance that the Challenger could have survived had the flame plume not been directed at the ET? 124.157.247.221 ( talk) 06:25, 20 January 2010 (UTC)
← While O-ring erosion and evidence of blow-by on previous missions certainly indicated the problem that led to the STS-51-L loss, the effects on flight dynamics cannot be compared. Whereas the worse previous case, STS-51-C, had resulted in "unprecedented penetration of the primary O-Ring and heavily charred effects on the secondary O-Ring" in the center field joint of the right SRB, the aft field joint of the right SRB of STS-51-L, which was recovered from the debris, showed a 27 in. x 15 in. hole burned through the SRB casing. ( photo) While wondering if the vehicle could had survived had the flames not been directed onto the ET could be regarded as idle curiosity, such a question would seem to influence future probabilistic risk assessment. That is, would any such burn through necessarily result in the loss of vehicle? 124.157.247.221 ( talk) 23:20, 20 January 2010 (UTC)
Hello you nice Pythias. Please excuse my poor English, I'm French.
I already asked this question in the French equivalent of your reference desk called the Oracle but I got poor answers.
Introduction : very often, speaking of the melting of the antartic cap (I know it's a continent, but there's ice on and around the continent), specialists speak of the western part of the Antartic.
Question : This western makes a sense for me for Europe, Africa and every where else in the world except Artic and Antartic.
What does it mean for the Antartic ?
Thak you very much for your explainations. Joël DESHAIES - Rheims in France - -- 90.7.206.69 ( talk) 14:24, 20 January 2010 (UTC)
We have West Antarctica. The French ref desk is called the Oracle? Over here we are explicitly not a crystal ball. I think that excludes all forms of divination. 81.131.36.119 ( talk) 14:31, 20 January 2010 (UTC)
Thanks. -- ✶ ♏ ݣ 15:17, 20 January 2010 (UTC)
Does a solid burn or does it change state to a gas first ? Purple pete2000 ( talk) 19:37, 20 January 2010 (UTC)
I don't think there is a single latitude or longitude consisting either completely of land or completely of water. But which latitudes and longitudes come the closest? JIP | Talk 19:51, 20 January 2010 (UTC)
I'm curious, does anyone have statistics on the distribution of ages at which people experience their first sexual intercourse? For example, (pulling numbers out of the air) perhaps 10% of people lose their virginity at age 15, 15% at age 16, 15% at age 17, and so on... I sometimes see claims about the average age at which people give up their virginity, but such reports almost never present much real data. I'm wondering if people know of any detailed data sets. Dragons flight ( talk) 21:28, 20 January 2010 (UTC)