This question has been asked by many people who have experienced an
electric shock before.I recently received an electric shock from the
domestic household current of 10A.The feeling was ecstatic. Many will come
across large AC currents, but have you ever thought of DC Electrification?
This would sound weird because DC current available in domestic premises
is in the order of mA (milliamperes). In industrial environments DC current
is available in large quantities and is very lethal when handled improperly.
The severity of a shock largely depends on:---Amount of current
---Amount of time on the exposure
---Resistance of the body.
AC:Alternating Current AC in theory would allow your muscles time to be able to move so that you could pull your hand / limb
away from whatever it was that was giving you the shock. This is so because AC alternates from zero
to maximum (amplitude) in a specified time frame (frequency).It is during this timeframe that muscle
signals may retract you hand/limb...
The time frame we are talking about here is only a few milliseconds-which means that for larger
currents, there is no time for reflex action. However as I said above,
this largely depends on the amount of current flowing.
Starting current of motors (128A) would never give you a chance of even thinking! AC current will allow you to move your hand for the muscles which are not in the path of the electric
current.In AC (Alternate Current) the muscles will contract and extend and through the spasms you
might eventually free yourself (that is why people say that the current threw them while, in fact,
it was their own muscles).
DC: Direct Current Definitely DC. The passing of current through the muscles make them contract.
In DC (Direct Current=0Hz) it will make your hand clamp the live wire; that is why, when in doubt,
you should touch wires with the back of the hand. In AC (Alternate Current) the muscles will contract
and extend and through the spasms you might eventually free yourself (that is why people say that the
current threw them while, in fact, it was their own muscles). No time for conscious efforts when under
current. Do not be fooled, NO ONE can sense the zero voltage "in between" the 50Hz (cycles per second!!!).
People tend to underestimate DC because in normal life one encounters very low dc voltages while the
mains ac is everywhere. Given the proper voltage DC will kill you. By the way, it is not as much the voltage
as it is the current. A potentially lethal (depending on the health condition) value starts from a 20mA current
through your body. The better the contact (e.g. wet hands, bare feet) the lower the lethal voltage.
You better stay away of voltages over 24V (AC or DC) if you have no special qualification. ---Electrical Engineer
If DC was used at 240v in household appliances then somebody would die every day. AC is very safe then DC
at high voltages because it alters its charges. DC can be safely and easily stored in low voltage in batteries
and that's why people have these wrong assumptions that DC is safe.
After the above arguments I have come to a conclusion that DC Current is far more lethal than AC because: DC will not release you at the point of contact with live conductor DC will cause fibrillations in the heart leading it to stop due to over-contracted muscles.This is caused by
AC also but DC is more severe.DC causes a clench in hand muscles that’s why when not sure, use the back of your hand.
The clenching causes the victim to grip the conductor and won’t let go.
Safety First Whichever the type of current in question, NEVER attempt to come close or even think of touching.
Follow all electrical safety tips when handling AC and DC. Both of the can kill with ease when mishandled.