Ah I remembered. A switch. It’s not doing the same thing twice getting different results. In one instance, a sink is introduced to the system which gives a path for electrons to flow. In the other instance, there is no sink, so the electrons stay.

 Ah I remembered. A switch. It’s not doing the same thing twice getting different results.
In one instance, a sink is introduced to the system which gives a path for electrons to flow.
In the other instance, there is no sink, so the electrons stay.

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