This model of a conducting body is called the two-terminal resistance element model. The
symbol and element relation is shown in Fig. 1.2-4. The connecting leads leading to the
resistive element on either side are of infinite conductivity and near-zero cross-section.
Ohm’s Law, which is an experimental law, states that the voltage drop across a two-
terminal resistance made of a linear conducting material is proportional to the current
entering the element at the higher potential terminal at a constant temperature.
Resistivity and conductivity are functions of temperature. If the temperature range con-
sidered is small, resistivity may be approximated ...
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