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It seems the water is not a very good conductor. Distilled water doesn't conduct at all.

Pure water is not a good conductor of electricity. Ordinary distilled water in equilibrium with carbon dioxide of the air has a conductivity of about 10 x 10-6 W-1*m-1 (20 dS/m). Because the electrical current is transported by the ions in solution, the conductivity increases as the concentration of ions increases.

Thus conductivity increases as water dissolved ionic species.

Typical conductivity of waters:

Ultra pure water 5.5 · 10-6 S/m

Drinking water 0.005 - 0.05 S/m

Sea water 5 S/m

for refence, Copper conductivity is 5.96 * 10^7 @20C.

Car batteries have great output for current as needed in starting cycle, and they are able to keep up the Voltage in Copper for some time even though the water conducts the current between the poles.

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