We have no meanings for "9 volt" in our records yet.
1 If I move the wires closer together, they still make a 9 volt potential.
2 If you build something like what I have, be careful with the 9 volt battery.
3 The gadgets use LEDs, powered by a 9 volt battery, to emit beacons of infrared light that are visible only through night vision equipment.
4 Suppose you have two wires connected to a 9 volt battery with the free ends of the wires held just 1 centimeter apart.
5 The electric potential difference between these two ends is 9 volts.
6 So now I have a 9 meter tall hill (instead of 9 volts).
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