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Is Vds necessay for Drain current (Id) or we can get Id by Vgs also as in books it is written that Vds is necessary.

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    \$\begingroup\$ If you open a door and there is nobody there to walk through it.. how many people walk through per second? \$\endgroup\$ – Trevor_G Mar 28 '18 at 19:14
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    \$\begingroup\$ @trevor_G - A: All of them. LOL. (Sorry, but I could not resist) \$\endgroup\$ – Norm Mar 28 '18 at 19:29
  • \$\begingroup\$ unlike a bjt, no current flows from G to S, so it must come through D \$\endgroup\$ – dandavis Mar 29 '18 at 0:04
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It sounds like you've already gotten the answer to this question from books, so I'm not sure why you're even asking. But to reiterate what you've read: the gate-source voltage creates a channel for current to pass through. The drain-source voltage creates current flow through the channel.

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