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How is the condition of an earth electrode measured?

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How is the condition of an earth electrode measured?

(a) by measuring the voltage

(b) by measuring the current

(c) by measuring the power

(d) by measuring resistance

I have been asked this question in examination.

This intriguing question originated from Measurement of Earth Resistance topic in chapter Measurement of Resistance of Electrical Measurements

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The correct choice is (d) by measuring resistance

For explanation I would say: The resistance of the earth electrode is measured in order to check whether it is in a good condition or not.

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