Answer / anonymous

Hey Buddy,

Low frequency (50 - 60 Hz) AC currents can be more dangerous
than similar levels of DC current since the alternating
fluctuations can cause the heart to lose coordination,
inducing ventricular fibrillation, which then rapidly leads
to death. High voltage DC power can be more dangerous than
AC, however, since it tends to cause muscles to lock in
position, stopping the victim from releasing the energised
conductor once grasped.

Answer / anoop

Many of the people here have simply written things without
knowing what it is. A.C is dangerous because of its larger
peak voltage and its ability to distort our hearts beating
cycle( causing fibrillation). D.C is dangerous because, a
person touching D.C will feel difficulty in leaving as our
muscles contract in one way and the person usually holds on
to the conductor.
But finally A.C is more dangerous.

Answer / ashish_dce

as we know that the value shown by any meter of ac is
actually it Rms value.the peak value of given ac is 1.414
time of this value,means if we have same valued ac n dc we
hav to withstand 41% more voltage if we r under shock.

Answer / nbsubrahmanyam

hi friends,

dc is more dangerous than a.c because dc is flow with some
magnetude value and without pulsating( uniform),if come to
a.c ,a.c is flowing with pulsating means current flows in
positive cylce and negative cycle. when ever positive cycle
complete , alternating currrent come to zero value,at that
time no shock will be there,then next current flows
negative cycle
for every cylce of a.c.,a.c comes zero value after
every positive cycle.
but in the case of d.c ,d.c will not have zero
value .
that's D.C more dangerous than A.C

Answer / macarroni spagghati

A.C is dangerous because of its larger
peak voltage and its ability to distort our hearts beating
cycle.eC is dangerous because, a
person touching D.C will feel difficulty in leaving as our
muscles contract in one way and the person usually holds on
to the conductor.

Answer / haribabu dasari

due to electric shock (a.c or dc)human nerves bring to
contrast wheather it is a.c or d.c. electric shock is
danger if human touch the conductor with palm, current
flows through human body, nerves undergo contrast finger
nerves also undergo contrast human hand grip the
conductor,this effects continuty of flow of current through
human body.(most of the people wrongly believes that D.C
current attracts human body,actually the fact is our hand
grip the conductor).if human touch the conductor with back
side of palm, nerves under go contrast, this will effects
hand bring far to the conductor,this effects human
disconnected from electric shock.(most of the people
wrongly believes that A.C current repel human body,actually
the fact is our body&hand bring far to the conductor due to
nerves contrast). a.c & d.c both are equal in danger.actual
danger is the way in which human touch the
conductor,wheather it is a.c or d.c.

Answer / rod pohl

AC is the most dangerous due to the frequency, at 50-60 Hz
you can not let go of the source, DC which is zero
frequency does not grab you and you can let go, Of course
every thing has to have voltage and current, With AC say
240 volt a current of 60mA can cause filiberation of the
heart but with DC it would take 300-500mA for the same
effect.In Australia 40 volt AC is considered extra low
voltage but 120 volt DC is the level for extra low voltage.
It is concerning that so few people have an understanding
of this subject, all electricity as dangerous and should be
treated with respect.

Answer / piyush rana

In Ac, due to sine wave, the voltage wave is coming to zero
at some instant during this time there is chance to get
released from the sock, but in DC the waveform is straight
& not coming to zero at any instant, So there is no any
chance to get released from the sock.

Answer / praveen v

If going by your analogy Srikanthreddy - 50 Hz being less
than 1000 Hz is more dangerous, then 0 hz being even lesser
than 1000 Hz must be more dangerous.

It is not simply frequency or holding current that matters.
The voltage matters as well.

It all depends on the situations & voltages. Removing all
that, if simply going by the fact that DC causes muscular
contractions & holds you continuously whereas AC holds for a
few moments & then throws you - DC should be considered more
dangerous, even though it is not a wholesome answer.

They are both dangerous.

Answer / ramesh r

hi all...
i cud see the most people are asking this question..
since i got working experience in siemens ..i would like to
share the things...v used to check with ac n dc testing...

theoretically whoever have said abt ac n dc were right...
but practically its different ..v never cared abt 220v
dc..even u can touch positive or negative (not both) nothing
will happen...
but v people would feel fear while testing ac..coz if u
touch any of the wire..u will get shock for sure...n

difference between ac n dc shocks are...when u get shock in
ac ur body will vibrate like anything due to frequency..that
wil make u sick n die...
in dc ur body will not vibrate as there is no frequency...
but u feel shock(i got shock many times in dc)....

advantage over ac is dc will give u time to release from the
shock...that is..its upto ur control(when u go its
control..u cant coz of no freq)...but ac will not give u
time to release...it is not in ur control until otherwise u
pull ur hand forcely(that too some extent)...

please dont say once current comes to zero or negative so it
will leave n all....ur point is right for 1 Hz ..when it
comes to 50Hz in sec...u cant...

both r dangerous...but AC is little bit more.....

I had applied for JE in PSEB, Can you pls send me the Question bank for related to my field

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