In the above circuit, ID is
1
\({I_D} = {I_{DSS}}{\left( {1 - \frac{{{V_{GS}}}}{{{V_{GS\left( {off} \right)}}}}} \right)^2}\)
2
\({I_D} = {I_{DSS}}\left( {1 - \frac{{{V_{GS}}}}{{{V_{GS\left( {off} \right)}}}}} \right)\)
3
\({I_D} = {I_{DSS}}\left( {1 - \frac{{{V_{GS}}}}{{{V_{DS\left( {off} \right)}}}}} \right)\)
4
\({I_D} = {I_{DSS}}{\left( {1 - \frac{{{V_{GS}}}}{{{V_{DS\left( {off} \right)}}}}} \right)^2}\)