Which Is More Dangerous AC Or DC

Hello guys, welcome back to my blog. In this article, I will discuss which current is most dangerous, ac is more dangerous or dc is more dangerous, which supply or current is responsible for an electric shock. Each and everything I will try to explain in a simple way.

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Also read - Difference Between Lifi And Wifi.

Which Is More Dangerous AC Or DC


Which Is More Dangerous AC Or DC

Many times in the interview this question is asked for electrical engineers, but many engineers fail to answer this question. Well, guys, I will discuss it in deep.



The intensity of the electric shock depends on the following factors:

01. The magnitude of current or voltage.
02.  Body resistance / dry or wet skin.
03. Path of the current in the human body.
04. DC or AC - effect of frequency.
05. Male or Female
06. Mass of the body.
07. Time duration

Current or Voltage


The electric shock is due to the magnitude of the current and the time duration that produces the effect.
Current or Voltage

The above figure shows a simple circuit that has supply ac or dc. The resistance R1 is the resistance of the skin of the supply side, the resistance R2 is the inside resistance of the body, the resistance R3 is the resistance of the skin of the ground side(where our body is touched to the ground). Whenever if the person touches the wire, the current flows through the skin (R1), then inside of the body and then the skin (R3) of the body. 

The current flows two times in the skin and one time in the inside of the body. The current is given by V/R, the R is the total resistance (R1+R2+R3). The value of R varies from 1K to 2000K Ohm. The resistance of inside of the body(R2) will be less nearly less than 500 ohms and the resistance of skin will be more. 

Therefore, it is difficult to predict the danger level of voltage because the body's resistance varies widely.

Factors affecting the resistance of the body




01. Skin condition - Dry or Wet
02. Sweating
03. Resistance goes down with continued contact and the burning of the skin.

In the dry skin condition of the body, the resistance will be 1.5 MegaOhm and when the skin is wet, the resistance will be 0.32 MegaOhm. Therefore, when the skin is wet, the chance of getting an electric shock will be more.

Effect of the path of the current in the human body


Effect of the path of the current in the human body

If the person faces an electric shock-like above image, then at small current he will die due to the current flowing through the heart

Effect of the path of the current in the human body

If the person gets an electric shock at leg then to die, high current is required because current flows only through legs.

Which is dangerous ac or dc




Case 01:

First, we will see at what current person is still safe and can remove hands.

The current which we can take will give us pain, with voluntary muscle control maintained. In this condition, we can remove our hands.

For males, the AC supply with 60 Hz frequency we can take current up to 9 mA, for the dc supply we can take up to 62 mA which is 6 times more than AC with 6o Hz, and for 10 kHz AC we can take up to 55 mA. Now we can say ac is more dangerous? Well, no, the correct answer is ac of 60 Hz is more dangerous than dc and 10 kHz AC.

The AC of 60 Hz is more dangerous because in less amount of current we will get an electric shock.

For female, DC = 40 mA, AC 60 Hz = 6 mA, AC 10 KHz = 37 mA.

Case 02:

The amount of current that person gets pain and loss of voluntary muscle control.

For males, the AC supply of 60 Hz frequency the current which is dangerous is 19 mA, for the dc 76 mA is dangerous and for the 10 kHz, AC 50 mA is dangerous. For females, AC 60 Hz = 10.5 mA, DC = 51 mA, AC 10 kHz = 50 mA.

If the 16 mA current flows through the male person's body then he will lose strength in hands. The 16 mA is an average current because when this was tested with a different person the current was varied from 10 to 22 mA. It changes from person to person it is not fixed.

amount of current that person gets pain and loss of voluntary muscle control.

The above graph will make you clear that the AC 50 or 60 Hz frequency is more dangerous than DC and AC 50 KHz.

Some other parameter affecting the intensity of the electric shock


01. DC offset of the waveform.
02. The health of the person.
03. Area of the conductor.
04. Age of the person.



I hope this article may help you all a lot. Thank you for reading.

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