How is geophysical exploration conducted?

In geophysical exploration, an "anomaly" is simply a deviation from an expected geophysical background measurement. "Anomalies" can result either from a real, physical change in the subsurface, or...

geoelectric tomography give me good results.

Some of the geo-physical methods of soil exploration are, (i) Seismic Refraction Method,(ii) Electrical Resistivity Method.

Geophysical method helps in identifying and mapping productive aquifers in ground water exploration.

In electricity current is conducted. The conduction is caused by a voltage and the amount of current conducted is determined by a resistance. This is in accordance to Ohm's law.