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Subject to preconditi***. We know that any substance is relatively insulated, and when the voltage at both ends of the material increases to a certain extent, the material can conduct electricity. We call this voltage a breakdown voltage. Capacitance is no exception. When the capacitor is broken, it is not an insulator. In middle school, however, such voltages are invisible in circuits, so they work below breakdown voltages and can be treated as insulators.