If you touch the two terminals of a power supply with your two fingertips on opp
ID: 1970256 • Letter: I
Question
If you touch the two terminals of a power supply with your two fingertips on opposite hands, the potential difference will produce a current through your torso. The maximum safe current is approximately 5 { m mA}.If your hands are completely dry, the resistance of your body from fingertip to fingertip is approximately 500 { m kOmega}. If you accidentally touch both terminals of your 120 { m V} household electricity supply with dry fingers, will you receive a dangerous shock?
If your hands are moist, your resistance drops to approximately 1 { m kOmega}. If you accidentally touch both terminals of your 120 { m V} household supply with moist fingers, will you receive a dangerous shock?
Explanation / Answer
from ohms law i=v/r 1st case i=120/500000 =.24 ma so will not recieve dangerous shock 2nd csae i=120/1000 =.12 =120 ma will recieve dangerous shock =120ma