|
Electrical Hazards and Ohms Law
A good reason to understand the relationship between current and voltage is that most of you have 120 volts out of every wall outlet in your house
Now, what kills you ---> the current
What decides how much current will pass through you given that the voltage is 120 volts? ---à your resistance
So, first a table of your resistances:
| Dry skin resistance: |
1000,000 ohm/sq. cm. |
| Wet skin: |
1,000 ohm/sq. cm. |
| Resistance between two hands if
sweating slightly: |
1,500 ohm |
| Resistance between two hands if
wet and touching ground |
500 ohm |
|
Now what current (in milliamps (1/1,000 amp) will do what to
you:
| 1 milliamp |
can feel it |
| 5 - 10 milliamp |
considerable muscular reaction
and pain |
| 10 - 20 milliamp |
paralyzes some muscles --> makes
it difficult to let go |
| 20 - 60 milliamp |
contracts chest muscles, causes
breathing to stop ---> death in minutes |
| 60 - 100 milliamp |
causes heart fibrillation -->
heart in chaotic motion canot pump blood, brain death
follows, then death |
|
Learn ohms law and be able to assess your danger.
|