In three pin plug why the upper pin is bigger in size?

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Upper pin is big in size becuase it is connected with earthing its big size indicates that its a  earthing point

Why earth pin is thicker and bigger in a three pin plug ?

Answer : Less resistance, touches the socket first and detaches last so that all stray current gets grounded to protect the equipment.

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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.

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Last Answer : Because Current flow in the conductor is inversely proportional to the conductor diameter. So if any short circuits occur in the system first high currents bypassed in the Earthling terminal. (R=Pl/a area of the conductor increases resistance value decreases)

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

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