Blue

Black

Green

Red

Not more than 8 ohm

Not more than 3 ohm

Not more than 2 ohm

Not more than 1 ohm

1

2

3

4

By connecting two earth in series

By adding more charcole

By connecting to earth in parallel

By adding more salt

Not less than 22.88 cm

Not less than 18.4 cm

Not less than 15.8 cm

Not less than 10.2 cm