Though voltage and current are two interdependent physical quantity, I would like to know what gives more "shock" to a person – Voltage or Current? In simple words, will it cause more "electric – shock" when the voltage is high or Current is more?
[Physics] What causes an electric shock – Current or Voltage
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After posting this I poked around the internet and found a PDF all about halogens that included some graphs. None of the graphs were voltage vs current, but I did find a graph that was voltage vs flux, as well as power vs flux. Using those two graphs I was able to find that find the actual power of my light.
Here are the two graphs that I found. I drew some lines on them (the black lines) to help me find the values I was looking for because it was hard to read them. Using the data from these graphs, assuming it's accurate, my halogen is using about 88% of it's 500w rating which is 440w.
This question is very complex and any complete answer would probably need to be book sized. There are many effects of electricity on the body and they all play a role in how dangerous any shock is. As others have noted, the important factor is current. However, besides intensity, frequency,duration and location are important. Also, a current that goes straight through a finger will hurt a lot, but be much less dangerous than one that goes through the heart.
Regarding the main effects of current on the body, they can be divided in thermal and non-thermal effects. Thermal effects mean that due to the resistance of the tissues through which the current flow, the tissues heat up and are eventually damaged. Watts, as mentioned in the OP is very important in this type of effects. Non-thermal effects are due to disturbance of the body's function through interaction with cells that normally respond to electrical currents, the nerves and muscles (the heart is a muscle also!). This is where it gets complicated.
There have been accounts of people on the electric chair surviving a first shock, but in which the current caused all muscles to contract so violently that bones were broken. Also, while a shock can send you in fibrillation, a defibrillator uses a carefully shaped shock to reinstate normal heart beating. While you would think that passing a current through the brain would not be a good idea, that is exactly what electroshock therapy does. Of course, this last one was abused, but my understanding is that in some cases, it's the only thing that remotely works for some patients. So, the effect of a specific accidental shock will be highly context dependent.
Another important factor in electrical shock is skin resistance. An intact dry skin has much larger resistance than a cut skin. For a given voltage, intact skin will allow a much smaller current to flow through the body than injured or wet skin.
Regarding the difference between voltage/amperage, one has to be very careful. A car battery can provide a very large amperage if required, but the voltage is still only 12 Volts. If you insert a large resistance between the terminals of the battery, the battery will not suddenly provide 100 amps because it can. Voltage is the same. You may have a very large voltage, but not enough charge to provide a large current. To get damage from an electrical shock, you need enough voltage to create a sufficient current through the body, and capacity to provide that current for enough time.
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You'd have to define 'shock', but what kills you is enough current during enough time, not voltage. Of course you need enough voltage to keep the current going over your body's resistance, but it definitely plays a secondary role.
In a former professional life I worked developing Residual Current Circuit Breakers, and 30 mA is the usual rating for devices aiming at protecting lives. In wet environments, such as bathrooms or swimming pools, sometimes 10 mA is recommended.
According to wikipedia's RCCB article, 25-40 ms of 30 mA is enough to send your heart into fibrillation, which probably qualifies as a pretty strong shock. That would require your heart being in the path of the current, though. This link has more information on what to expect depending, again, on the current, not the voltage.