Used to turn on the power or electrical current place.
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diàn jí
A non-metallic parts of the circuit to establish electrical contact (as in the electrolytic cells, batteries, tubes, or arc lamp) of the conductor (such as metals or carbon)
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No. 3
Current entering or leaving the medium adopted by the electrical conductor. For example, dry batteries have positive and negative, is the current outflow and inflow of the two electrolyte electrodes.