120 volts can kill you
Is it the current that kills you, not the voltage?
No, this is a misleading simplification. People are very resilient. Without high voltage can not Electricity flowing through a person to power them.
It's not the voltage or the current that kills you; It's the energy.
However, if you rub your feet across a carpet on a dry day, you will become charged Thousands of volts on . If you then touch a grounded metal object, the discharge can several amps of electricity send through your body:
about 5 to 7 kilovolts was the maximum value measured on humans. ... asked him to shuffle his feet while connected to the electrostatic voltmeter. Much to the surprise of the EMC laboratory, the voltmeter registered 18000 volts ! A Brief History of Electrostatic Discharge Testing for Electronic Products
It should be mentioned that the reference model of the ESD waveform is the human-metal discharge. ... The maximum ESD current value is 12 A while the IEC standard 15 A Are defined. Electrostatic discharge current linear approach and circuit design method
This is far more than 25 V and 70 mA. So if these can each kill you, why not ESD? Because the duration of the discharge is a fraction of a microsecond and the total energy release is only a few millijoules. It doesn't have enough time to cause fibrillation or heat and burn significant amounts of tissue.
"The effects of electrical current flowing through the human body are discussed in detail in the International Electro Technical Commission document IEC 479-2: 1987. This document indicates that a transient or capacitive discharge, as is the case with static electricity is the case, energy is required over 5 joules (5000 mJ) to create a direct serious health risk. "- Static electricity in modern buildings
The reason this "safety tip" is terrible is because it misleads people into thinking that high current sources are dangerous to touch and high voltage sources are not.
Most power sources are voltage sources, not current sources. This means that they output a constant voltage and the current in the circuit depends on the resistance of the load (in this case, the human body). This applies to power lines, batteries, etc. Most people fail to understand that the current indicated on a power adapter is only a maximum rating and will not flow through their body when they are touched.
If you connect a 1 kΩ resistor to a 12 V supply, the same 12 mA current will flow regardless of whether the supply reads 100 mA or 100 A. The amperage of a power supply unit only indicates the current that it delivers when connected to a could small enough resistance. It doesn't force that amount of electricity through anything it touches, or it would keep flowing through the air.
Yes, car batteries can deliver a lot of current (hundreds of amps) but it only does so when connected through a small resistor. If you connect a screwdriver to the terminals, a large current will flow and the screwdriver will melt, the battery will explode, etc. If you put your hands over the terminals, nothing will happen. This is because the resistance of your skin is much higher than the resistance of the screwdriver. The 12 V 600 A car battery will not do you any harm because the voltage is not high enough.
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