Also, how far can electric current go before it is completely lost?
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As for the second question, there’s no hard limit, but there’s only so much resistance that a particular current will be able to push through before it’s *effectively* gone.
As for what resistance is, we need to understand what current is in the first place. Whenever you have a large structure of atoms, their atomic bonds have some ability to let electrons move from one atom to the next. That movement is electricity, and metallic bonds are the most forgiving for letting electrons jump back and forth. However, materials like wood (which is a series of hydrocarbon chains) are 1) sharing fewer electrons to make their bonds, and 2) have much more discrete molecules rather than how an iron bar is just a whole bunch of atoms stuck together. So every time an electron wants to get to the next wood molecule, it’s a lot harder to change than just moving around the next atom.
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