Which one is harmful for human body high voltage or high current?

Scenario 1:
If human body contact with a wire having Voltage 120 V and Current 50 A. (Is it harmful for human body?)

Scenario 2:
If human body contact with a wire having voltage 440 V and Current 4 A. ( Is it harmful either?).

tipu_sultan said:

Scenario 1:
If human body contact with a wire having Voltage 120 V and Current 50 A. (Is it harmful for human body?)

Scenario 2:
If human body contact with a wire having voltage 440 V and Current 4 A. ( Is it harmful either?).

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Both are lethal! It takes surprisingly little current to be dangerous . . it is a matter of where it is touched on/in the body and where it must travel through. In your examples, it won't matter where they touch because both are potentially lethal . . don't ever expose your body to that much voltage or current and even at much lower levels you must always exercise caution and safety!!!!

Lets consider a 200 AH GEL Battery which is fully charged (12 V).
Is it harmful when contact to human body?

tipu_sultan said:

Lets consider a 200 AH GEL Battery which is fully charged (12 V).
Is it harmful when contact to human body?

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Depends on your method of contact.

The current indication isn't the current that actually flows, but the maximum that the source can generate. The actual current is given by the voltage divided by the resistance (in this case that of the human body).
A battery 200AH 12V means that the voltage at its poles is 12V and the maximum energy is 200 AH (roughly it can generate 200 A for 1 hour). But the current flowing into the load is given by 12V/(load resistance).
Have a look to:

https://www.edaboard.com/threads/74087/

would you please clarify me with some theoretical examples or some web link?
I m confused!.

tipu_sultan said:

would you please clarify me with some theoretical examples or some web link?
I m confused!.

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Theoretically don't touch live wires...unless you want to be used as an example of what happens.

It isn't the voltage or the current that matters (at least until the voltage starts arcing which will cause severe burning), it's how much of it is absorbed or passes through the body. A Human body has electrical resistance which tries to prevent current flowing, the current it can actually pass depends on how well the contact is made to the body, the resistance of the path it flows through (could be across 1mm of skin or from head to toe) and how much voltage is there to 'push' the current through. Higher voltages will 'push' harder so are potentially more dangerous but through a low resistance body path even a small voltage can do harm.

Example: Take a small 9V battery, the type with two terminals on top. Place a finger on your left hand on one terminal and a finger on your right hand on the other. 9V is there but you will not feel anything. Now place the same terminals across your tongue (remove your fingers from them first!) and you will get a nasty tingle. The same 9V is there but the path through your tongue allows a higher current to flow than from hand to hand.

The amount of power available is almost irrelevant, it's only the amount that can pass through your body that matters. Analogy: Which is more dangerous, having a 100Kg block of concrete dropped on your head or having a 100Kg block of feathers - answer, they are equally dangerous.

Brian.

People are normally killed by a current flowing through their heart and stopping it so it depends how the current flows through the body, hand to hand is very dangerous. Trips to protect people are in the order of 10-30 mA, voltages of 50 VDC or 60 volts AC peak are considered safe. This is because under ordinary circumstances these voltage will not drive a lethal current into a body, so 12 V is considered safe though look out for metalic wristwatch straps, necklaces etc.
Frank