who is responsible for electric fixation
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We will feel an electric shock when sufficient current flows through our body for a long enough time.
An average human being starts to feel a tingling sensation at 1mA, feel pain at around 5mA and death due to fibrillation (irregular contractions due to electric shock) of the heart can start occuring at 30mA for a short duration of 1 to 2 seconds[1]. The above are figures for AC and the numbers are slightly higher for DC to create similar effects.
In order for current to flow through a human body, a potential difference measured in volts need to be present to push the current through the body. The higher the voltage, the higher the current pushed through and the more dangerous it is.
This seems to suggest that low voltage isn't dangerous. But it isn't necessarily true. If we were to apply a low voltage of 10V right across a human’s heart by sticking 2 needles into the chest area, it can be fatal. This is because the resistance across a human heart is much less than the resistance across a human from hand to leg. So while 50VAC and above can electrocute a person touching a bare live wire, a lower 10V can be fatal if directly applied across a human heart.
In summary it is the current that flows through the body that causes the electric shock but it is the voltage level and the electrical path’s resistance that determines how much current flows. So the voltage level of a circuit is taken as the determining factor of how dangerous it is and the precaution level needed to work on such a circuit. That is why we see signs that say ‘Danger High Voltage’ and not ‘Danger High Current’.
We will feel an electric shock when sufficient current flows through our body for a long enough time.
An average human being starts to feel a tingling sensation at 1mA, feel pain at around 5mA and death due to fibrillation (irregular contractions due to electric shock) of the heart can start occuring at 30mA for a short duration of 1 to 2 seconds[1]. The above are figures for AC and the numbers are slightly higher for DC to create similar effects.
In order for current to flow through a human body, a potential difference measured in volts need to be present to push the current through the body. The higher the voltage, the higher the current pushed through and the more dangerous it is.
This seems to suggest that low voltage isn't dangerous. But it isn't necessarily true. If we were to apply a low voltage of 10V right across a human’s heart by sticking 2 needles into the chest area, it can be fatal. This is because the resistance across a human heart is much less than the resistance across a human from hand to leg. So while 50VAC and above can electrocute a person touching a bare live wire, a lower 10V can be fatal if directly applied across a human heart.
In summary it is the current that flows through the body that causes the electric shock but it is the voltage level and the electrical path’s resistance that determines how much current flows. So the voltage level of a circuit is taken as the determining factor of how dangerous it is and the precaution level needed to work on such a circuit. That is why we see signs that say ‘Danger High Voltage’ and not ‘Danger High Current’.
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