The unit of electric resistance is the ohm (Z) where one ohm is one
volt per ampere. It is defined as the resistance between two points in a
volt per ampere. It is defined as the resistance between two points in a
conductor when a constant electric potential of one volt applied at the
two points produces a current flow of one ampere in the conductor. Thus,
where V is the potential difference across the two points in volts and I is
the current flowing between the two points in amperes.
The reciprocal of resistance is called conductance and is measured in
siemens (S). Thus,
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