Mosfets & Resistance: How Does Vgs = Vds?

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SUMMARY

The discussion centers on understanding the relationship between gate-source voltage (Vgs) and drain-source voltage (Vds) in MOSFETs, particularly in the context of resistance. A participant questions how Vout can equal 15 volts when the top MOSFET has a resistance of 5k ohms. The explanation provided emphasizes that if no current flows through a resistor, there will be no voltage across it, which is crucial for understanding MOSFET operation.

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photonxyz
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This isn't a homework question... I'm just trying to understand Mosfets in general. I've been reading about them, and I find them really interesting- very cool. However, I don't understand how the Vgs = Vds if the mosfet itself has resistance!? For example, I found this in a text and I fail to understand how Vout can equal 15 volts if the top mosfet has a resistance of 5k ohms.
 
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That looks pretty mysterious.

If you are going to refer to a diagram, you need to include the diagram or redraw it and include that.

Generally, though, you probably know that if there is no current flowing in a resistor, there won't be a voltage across it. This seemed to answer what you were asking, but it is hard to be sure without a diagram.
 

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