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Electric motor dangers to pregnant women?

20 messages,  Last post on Feb 09, 2009 at 12:45 PM

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#12 of 20 Re: [saidiadude] by randyl712 Oct 20, 2008 (5:52 am)
Replying to: saidiadude (Oct 19, 2008 7:10 pm) Talk about a stretch - even the study's conclusion says that only 1% of the leukemia could possibly be attributable to the power lines, "though this estimate has considerable statistical uncertainty" and that "the relation may be due to chance".   Try again.
#13 of 20 EMF by pat85 Dec 10, 2008 (8:10 am)
High Voltage power lines in the US are 40 thousand Volts Alternating Current. The Hybrid batteries are a few hundred Volts DC (direct current) Huge difference   Further, as far as the electric motor, it is in front of the engine and under the hood. This is what's known as a Farraday shield. Why a car is the safest place in lightning is because it is steel and is a Farraday shield.  As far as the cables from the batteries under the rear seat to the electric motor, the cables are conducting current to and from the motor.. It is an electric circuit. The current is flowing from the positive battery terminal and returning to the negative terminal. That means that EMF induced by the positive is cancelled by the EMF induced by the negative currents. The EMF's are self cancelling.   If the magnetic fields are a concern, they are described in Maxwell's Equations. Firrst, there are no magnetic dipoles. The Delta operator times the B vector field is zero. There are magnetic field generated by a wire carrying current, Each wire induces a magnetic field according to,the right- hand-rule. If the thumb is pointed in the direction of the current, the magnetic field lines will be in the direction of the curled fingers. If you do that for both wires from the hybrid battery, current is going in opposite directions, so the currents induced by varying magnetic fields cancel.   Replies to this message: stevedebi (Jan 15, 2009 1:28 pm) wwest (Jan 16, 2009 6:59 pm) stevedebi (Jan 21, 2009 3:38 pm)
#16 of 20 Re: EMF [pat85] by stevedebi Jan 15, 2009 (1:28 pm)
Replying to: pat85 (Dec 10, 2008 8:10 am) "Further, as far as the electric motor, it is in front of the engine and under the hood. This is what's known as a Farraday shield. Why a car is the safest place in lightning is because it is steel and is a Farraday shield. "   I thought the lightning safety was due to having rubber tires between the metal of the car and the ground, thus having no path for the lightning to pass through? Replies to this message: wwest (Jan 16, 2009 6:59 pm) stevedebi (Jan 21, 2009 3:38 pm)
#17 of 20 Re: EMF [stevedebi] by wwest Jan 16, 2009 (6:59 pm)
Replying to: stevedebi (Jan 15, 2009 1:28 pm) You think lightning that has just jumped across a cloud to ground (or VV) 5000 ft gap will see any problem with the wheel to ground gap....??   The car's metal roof and "shell" is a much better conductor than is your body.....   And a farraday shield is used to block, "divert", or suppress electromagnetic waves and maybe some level of electrostatic coupling. No affect on lightning one way or another insofar as I know. Replies to this message: stevedebi (Jan 21, 2009 3:38 pm)
#18 of 20 Re: EMF [wwest] by stevedebi Jan 21, 2009 (3:38 pm)
Replying to: wwest (Jan 16, 2009 6:59 pm) "You think lightning that has just jumped across a cloud to ground (or VV) 5000 ft gap will see any problem with the wheel to ground gap....??    The car's metal roof and "shell" is a much better conductor than is your body.....    And a farraday shield is used to block, "divert", or suppress electromagnetic waves and maybe some level of electrostatic coupling. No affect on lightning one way or another insofar as I know. "   Lightning will probably follow a different course to ground if offered one that goes to the ground (like a tree) as opposed to one that is insulated by rubber.   I didn't make the claims about a farraday shield, that was a previous post.
#19 of 20 Dangers of EMF by MB_in_MN Jan 23, 2009 (1:54 pm)
We looked into this issue two years ago when the utility company was relocating the poles closer to the house. It is true that the correlation with cancer is weak, if it exists at all. That does not mean it won't or will happen; it only means that there are probably so many other variables that contribute that EMF is the least of our worries. Your chances of being killed in a car accident while worrying about EMF exposure are probably much greater. And don't forget about what you eat and exposure to a multitude of natural and synthetic carcinogens through various sources. And that gasoline that you put in the tank? Chock full of known or suspected carcinogens.   The EMF link appears to be related to long-term continuous exposure (bedrooms near power lines). Unless you spend all day in your car, it would be hard to duplicate.   And on the question of shielding. are the cables from the battery located outside the cabin or inside? If outside, the body will provide all the shielding that you need.
#20 of 20 Faraday Shield by pat85 Feb 09, 2009 (12:45 pm)
Lightning has enough voltage to jump from the car body to the ground over wet tires which may be somewhat conductive. The metal of the car body will conduct the electricity on the outside or the metal car, not allowing it inside. That is how a Farraday shield works.  It does not matter where the battery cables are inside the car. The current flows from positive and returns to the negative. It has equal and oppossite current.    A for power lines near your house, you are not in a Farraday shield unless you live in a metal building, such as a quanset hut.  Tall buildings with steel girders are also safe in lightning storms, because they are a Farraday shield

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