Answer Posted / naveen kumar mishra(03\08\1987

the most easy to calculate the specified earth
resistance,is by using earth testor.
a earth testore is a electric generator which generate the
electric voltage as per constant speed of that rotor
(generator).
if any low resistance load will apply across that voltage
so an electric current will also generate.
by this current,and voltage,we can calculate the value of
applied load resistance.
so lets assume----------
the voltage value generated by earth testor

is = V volts,

and current value is = I amp

so according ohms law

the applied load value will(earth resistance) = R

SO R =V/R ohms.

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