Figure 7- iD versus Vgs for an enhancement-mode MOSFET.
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The value of the drain current when Vgs is zero is identified as IDSS.
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Equation indicates a complicated and nonlinear relationship between iD and the two voltages,
vDS and Vgs.
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Where we use upper-case Vgs to indicate that the resistance is defined for a particular
constant value of gate-to-source voltage.
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For higher Vgs, the relationship between iD
and vDS is approximately linear indicating that the MOSFET behaves like a resistor whose resistance depends on Vgs.