Description : Why in a three pin plug the earth pin is thicker and longer than the other pins?
Last Answer : A:It depends upon R= ρl/a where area(a) is inversely proportional to resistance (R), so if AREA increases, RESISTANCE decreases & if RESISTANCE is less the leakage current will take low ... the connection and last to disconnnect. This assures Safety for the person who uses the electrical instrument.