K

Which is more dangerous a.c or d.c?

7 Answers
I want to know wether a.c is more dangerous or d.c?
J

First, it depends on the voltage. At common, low voltages, AC and DC are both relatively safe. Ordinary skin (not wet) is relatively high resistance and it takes a bit of voltage (~70 volts or so) to push enough current to be felt, at least with AC. At higher voltages, AC has a tendency to cause muscles to 'vibrate', so it is possible to 'let go' or release your hold on the conductor. DC, on the other hand, has a tendency to cause muscles to 'lock up' or clamp tight and freeze, making it impossible to release your grasp. With DC, if the current passes from one arm to the other, it can pass through your chest and may cause your heart to 'seize up' and stop beating, which is not a good thing!. At equivalent voltages, I would say DC is more dangerous. At high enough voltages, it makes no difference. AC or DC will both cause burns and nerve damage. Simply put, when you're dead, you're dead

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R

In cases of electrocution, current kills is what my electrical teacher always said. The higher the current (amperage), the greater the risk of death. As specified in other answers, A.C. tends to be more deadly, since A.C. is used in applications that require more current and voltage, where as D.C. tends to be used in smaller things. However, cars batteries are DC, and getting shocked by one of those may force your muscles to contract and force your grip to tighten.

Also, voltage does have a part in this. We come into contact with high voltages all the time. A static shock is an example of this. However, just because the voltage is high doesn't mean that it will kill you. I would much rather take a high voltage shock with low amperage, than the other way around. Again, it's the amount of current that matters when it comes down to whether you will die or not.

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D

Both at the same voltage are equally dangerous and can kill.However,there is a catch.In the case of mortality,DC is more likely to kill than AC at the same voltage(upto a maximum of 400 Volts.Above that,you will start to fry almost on contact).This is because in AC electric field polarity changes every time depending on frequency hence at one time it will hold on to you and in the next,repel you hence you have a slim chance of escape.DC on the other hand permanently locks your muscles onto the site of contact and you get a thourough shock till death.(AC of higher voltages also does a similar thing as it keeps switching electric field polarity so fast)
However DC currents of even 100 volts outside of certain factories and engineering labs are rare unlike AC which is almost universal and causes the majority of deaths.

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R

Both of them can be very dangerous if the current is strong enough. In domestic life, DC is usually with much smaller voltage and ampage, so it cannot harm the human body, while AC comming from the wall socket is much more powerful. But this is a differnence in the implementation, not something connected to the essence of AC and DC themselves.

Others correctly mentioned that AC could be a bit more dangerous, because the alternating polarity might have stronger adverse effects on the human heart and other vital organs.

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P

AC tends to have a more disrupting affect on the heart because of the way the polarity changes direction 50 or 60 times a second. However at the voltages used in the home both DC and AC can be dangerous especially at 240 volts. Currents of the order of 100 to 200 milliamps can be fatal.

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L

Really depends on the ampage. Edison tried to prove that AC was more dangerous by electrocuting an elephant. Both can kill, but DC is rarely used at a high enough ampage to be dangerous.

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S

A/C is very dangerous , it tends to hold it victims in place , unlike D/C whichn repells anyone in contact.

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