It is because water is a good conductor of electricity so the person would get shock will wood is a poor conductor or insulator of electricity and resist it passing through it so the person would not get shock.

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A person standing on wet floors gets an electric shock if he touches on electrical wire while the same person standing on a wooden board does. It because our body is good conductor of electricity and so water but on the other hand wood is bad conductor of electricity. ........hope this will help u
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