ELECTRIC QUANTITIES ASSOCIATED WITH HUMAN INJURY

WHAT IS THE SEVERITY OF DIFFERENT ELECTRICAL QUANTITIES ON HUMAN BODY?

WHICH CURRENT IS MORE DANGEROUS AC OR DC?

The electrical quantities effect (loss) the human body more severely.The current is more severe than voltage.Because electric shock that effect (loss) human body is mainly due to electric current pass through the body.

The different electrical quantities severity that effect (loss) human body is given below:

1.Current: The intensity of shock is depend upon magnitude of current.So,high magnitude current is more dangerous than low magnitude current.

→Severity: AC is more dangerous than DC.Because value of maximum current at AC is more than DC at same voltage.

In case of AC;

Imax = √2.Irms 

In case of DC;

Imax = Irms

2.Voltage: According to ohm's law the current pass through the body is directly proportional to applied voltage.

I ∝ V 

Means higher the voltage higher the current.Thus high magnitude voltage is more dangerous than low voltage magnitude.

3.Frequency: Low frequency voltage is more dangerous than high frequency voltage.

Time period (T) = 1/f (frequency)

By above formula we see that low frequency has more time period than high frequency.Thus the current wave pass through the body take more time and thus it effect (loss) the body more.

4.Resistance: Low magnitude of  resistance is more dangerous than high magnitude resistance.According to ohm's law current is inversely proportional to resistance.

I ∝ 1/R

Means lower the resistance of body higher the current flow through it and it is more effect (loss) the body.

Electrical Danger Plate Yard

SEVERITY OF AC AND DC:

We know that AC and DC,both is dangerous for human body.But AC is more dangerous as compare to DC.The root mean square value of AC and DC both are same for same magnitude of voltage.But at the time of electric shock the max value of AC also works and it is √2 times than DC at same voltage.

Imax = √2.Irms = √2.Idc

 Thus AC is more dangerous than DC for human body.

Conclusion: All the electrical quantities like current voltage etc are very dangerous for human being.So,at the time of electric work,at the time of use of electric equipment should be take suitable precaution.