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Summary: How a battery-driven light board works in this free video on science project ideas.
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"Hi. On behalf of expertvillage.com, my name is Sean Graham, sponsored by Goturnkey.com. Okay, now we have all the wires connected together so we'll just summarize. Here you have number one which is the negative to the battery unit. That is connected to the negative of the light unit, here. Okay, number two. Number two is the positive of the battery unit. That is actually connected to the positive unit of the, you see it, positive unit of the conductor."
eHow Article: How a Light Board Works
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