Overproduction of polar bears according to Darwins natural selection

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

you can cut your hand off if your not