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This shows a <a href="http://en.wikipedia.org/wiki/Wheatstone_bridge">Wheatstone
Bridge</a>, a circuit that can be used to measure resistance. Here,
the bridge is balanced, so there is no current flowing in the central
wire. Typically, one of the resistances is unknown, and the other
resistances are adjusted until the bridge is balanced. The unknown
resistance can then be calculated from the others.
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