Physics · Electrical Measurements
In an Earth Tester used for measuring earth resistance, alternating current (AC) is used instead of direct current (DC) primarily to:
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- 1Avoid measurement errors due to electrolytic and polarization effects in the soil✓
- 2Ensure the potential gradient remains constant over the distance between electrodes
- 3Reduce the inductive reactance between the test electrodes and the surrounding soil
- 4Increase the sensitivity of the instrument by enhancing current through the earth electrode
Correct answer
Avoid measurement errors due to electrolytic and polarization effects in the soil
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