#resistance_unit  the reciprocal of conductance
  supertype:  electromagnetic_unit__electromagneticunit__emu  any of various systems of units for measuring electricity and magnetism
  subtype:  abohm  a unit of resistance equal to a billionth of an ohm
  subtype:  ohm  a unit of electrical resistance equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampere
  subtype:  megohm  a unit of resistance equal to one million ohms

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