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Current mirror with FET

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elearn

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Hi,
Iam trying to understand how current mirror with FET works. I read on wikipedia that Id is a function of Vdg and Vgs, sure enough. and Keeping Vdg = 0 and driving a current with current source shall set the Vgs. This part is confusing - unless you have Vgs how can the mosfet even allow Id ?
As i Understand - the channel of the mosfet allows current only if there's a Vgs enough to widen the channel and Vdg helps in sucking the current.

Current mirror with BJTs is clear: the collector resistor connected to the base drives base current to bias the transistor and thus sets Vbe.

Can somebody explain current mirror with mosfets ?

TIA
 
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