Thread: Hybrid World Rally Cars
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20th December 2015, 23:57 #21
+10 That’s the key issue what is ecological or not.
That doesn’t mean that all the current will go true the water. Considering water and a human body two different resistors, they are connected in parallel. Googling for some “facts”:
https://en.wikipedia.org/wiki/Electric_shock
Body resistance[edit]
The voltage necessary for electrocution depends on the current through the body and the duration of the current. Ohm's law states that the current drawn depends on the resistance of the body. The resistance of human skin varies from person to person and fluctuates between different times of day. The NIOSH states "Under dry conditions, the resistance offered by the human body may be as high as 100,000 Ohms. Wet or broken skin may drop the body's resistance to 1,000 Ohms," adding that "high-voltage electrical energy quickly breaks down human skin, reducing the human body's resistance to 500 Ohms."[15]
https://en.wikipedia.org/wiki/Water_resistance
the electrical resistivity of water (0.2 Ω·m sea water, 2 to 200 Ω·m drinking water, 18000 Ω·m deionized water at 20°C)
If a dry human body has a resistance of 100 000 ohm and the water has 2 ohm and both connected in parallel with a voltage of 600 V, the current true the water would be 300,000 A (assuming no fuse blown) and true the body 0,006 A = 6 mA (total current = 300,006 A)
If the resistance of the skin is broken and the resistance will decrease to 1000 ohm the result will be:
True water = 300 A
True body = 0,6 A = 600 mA which would be lethal.
Total current = 300,6 A
Some facts about voltage & current: true a human body.
http://sprott.physics.wisc.edu/demobook/chapter4.htm
Average Effects of Continuous ac or dc Electrical Currents on Healthy Adults
Electrical Current Biological Effect
1 mA threshold for feeling
10-20 mA voluntary let-go of circuit impossible
25 mA onset of muscular contractions
50-200 mA ventricular fibrillation or cardiac arrest
And from a Finnish web site http://www.epanorama.net/faq/sfnet.h...hkoverkko.html
Mitä erisuuruiset ihmiskehon läpi kulkevat virrat vaikuttavat? (How does different amount of current through the human body affect?)
From and above 50mA. Dangerous threshold. The current will affect the heart. If the current affects longer than 0,5 sec, it will cause a heart-stopping or ventricular fibrillation.
From 80 mA and above. Lethal.
As can been seen it’s not all about the voltage but how much current goes true the human body and also about the route true the body (true the heart or not).
Also the resistance of a human body is dependent off the voltage and it will decrease if the voltage increase. With 230 V voltage the resistance is about 11,7 kohm from hand to hand and about 1 k ohm from hand to leg. Also the durability of the shock is vital.
And don’t ever never disconnect the green-yellow wire. It’s not there for fun.“Don’t eat the yellow snow” Frank Zappa
Will Oliver get more Rally1 chances in 2025, are there any signals?
Oliver Solberg