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jamesqf is right about resistance and electrical usage.
I remember thinking the same thing though when I was in high school about resistors - they cause a voltage drop and do warm up, so they must waste energy. Luckily this is not the case, or at least they don't waste more than about 1% of what I thought back then....
The block of wood DOES conduct some electricity. It's inversely proportional to its resistance, so it is essentially none.... just like you will conduct electricity at 12V. Not enough to feel it usually, but some.
Just think about how hot those resistors would have to get if they took a high speed fan and took enough energy away from it to make it run 1/3 as fast.... lots of E would transfer to a fiery resistor really quick. Luckily they just get warm.
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