The potential you build up by simply walking on carpeting ranges from 12,000 to 20,000 volts. This is why your cat doesn't like you, touching his nose is only funny to one of you.
I think the point the OP was asking about was the difference between voltage and current in terms of lethality.
I once worked on TV's at a service bench. I can tell you that a human can be exposed to the same voltage that is available on a typical utility feeder atop a tall pole: about 34 kv. The difference that allows me to be here typing this post today is the comparatively low current associated with that voltage exposure.
Basically, current does three potentially deadly things, when there is sufficient amount of it, applied to the right place in the body:
1) Burning. Just like those electric hod dog cookers that passed a current through the wiener to cook it. Yep. The myoglobin DOES look that that brown stuff!!!
2) Cardiac signal problems. The heart has electrical signals that are easily overridden by currents. That's how those paddles work when they shout "CLEAR!"
3) Muscular contraction. This is a step above #2 when it comes to the heart, as enough current through the heat muscle prevents any meaningful movement while the current is applied. This does not happen in most cases. It can also prevent breathing and the ability to "let go" of an energized conductor.
These are current events. If the current cannot rise beyond a few milliamps (unless applied directly to the chest) you are usually not dead or dying.
Does that help?
[Avatar photo from a Florida training accident. Everyone walked away.] 2 Tim 3:16-17
There is a lot more to electrocution but this is a start. For one, different forms of electricity may or may not induce ventricular fibrillation in the heart, which is where you drop and hope someone starts CPR as another runs for an Automatic External Defibrillator or AED. BTW, defibrillation is usually 200-360 joules or watt seconds of dc countershock.
If you survive, you may still go into renal failure 3-5 days later as the myoglobin in your blood clogs your kidneys. Ever noticed that brown jelly-like stuff when you fry a bloody steak? That's what your myoglobin looks like in your bloodstream after an electrical shock.
I got stuck once, went in left hand and out right hand and arm, ended up with an exit wound on right hand and mild burns on right arm. The scariest and most painful thing I have ever experienced. Not being able to scream or move, the only thing I think that saved me was the fact I was crouched in an awkward position and eventually fell backwards. No idea of how long I was stuck but it felt like forever. Many blood tests over a few days and heart monitoring I was lucky. Electricity scares me even years later, not sure if that is good or bad, but I am sure careful around it. There was a nosy store manager that came on the roof just before that had no idea of what was happening or what to do, even after I laid on the roof in the fetal position.