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david90
Joined: 05 May 2004
Posts: 368
Helped: 1
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 13 Oct 2004 5:50 100v 2200uF cap fatal? |
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| Is a fully charged 100v 2200uF cap fatal if touched?
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tochaHCM
Joined: 29 Sep 2004
Posts: 97
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| 13 Oct 2004 5:54 Re: 100v 2200uF cap fatal? |
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| Sure, just calculate the current dircharge to your body in 1 second. It can enough kill if you are weak.
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david90
Joined: 05 May 2004
Posts: 368
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| 13 Oct 2004 6:01 100v 2200uF cap fatal? |
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what is the equation?
100v/1MIL OHM (body resistance) = .0001 or .1mA MAX.
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glenjoy
Joined: 01 Jan 2004
Posts: 1021
Helped: 47
Location: Philippines
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| 13 Oct 2004 6:05 100v 2200uF cap fatal? |
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100V/(resitance of your body) = Current
Current in milliampheres can already kill you if passed through your body. Bodies resistance is in megaohms or greater (correct me if I am wrong), so it will require a large amount of voltage to get the said amount current flowing through the body.
The amount of time it will take to fully discharge the said 100V of capacitor to 0V is T = RC, but of course maybe voltage below 50V cannot sink current through the body anymore... Please correct if I am wrong.
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david90
Joined: 05 May 2004
Posts: 368
Helped: 1
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| 13 Oct 2004 6:25 100v 2200uF cap fatal? |
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say ur body resistance is 1M ohm.
100v/1M is 0.0001 AMP. that's not enough is it? Plus it is not always at 0.0001 AMP cuz it will decrease exponentially
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House_Cat
Joined: 21 Feb 2002
Posts: 1349
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| 13 Oct 2004 6:55 Re: 100v 2200uF cap fatal? |
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5ma - 9ma can cause ventricular fibrilation or heart siezure in an adult male when delivered across the heart muscle.
The human body is filled with conductive fluid - saline as part of the blood. The resistance you measure from finger tip- to-finger tip will vary depending on the condition of the skin. The only insulator you have is the layer of dead skin cells on the epidermis. If the skin is wet, the resistance can be quite low. Typically, the resistance from one hand to another can be between 1Mohm and 1500ohm when "dry". If the skin is wet, the resistance can be as low as 100-500 ohms.
Now for the fun part - since the only insulator you have is the outer layer of dead skin, you must consider the breakdown voltage of your insulator in the question that was asked. When the epidermis is exposed to a potential difference of ten volts DC (10VDC) or more, the cellular structure begins to break down and the skin resistance begins to decrease. The breakdown is seen as a skin burn at the points of contact with the voltage source.
For the question asked here, the 100vdc charge on the capacitor is more than sufficient to break down the skin and pass current of up to 100vdc/500ohms = 200ma peak pulse. If the current is across the chest, heart siezure is possible. What is more likely to happen is contraction of the arm and body muscles which causes you to jerk away from the capacitor - but I wouldn't want to bet on it.
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