Hello, I am not sure of the answer to this question.
Can someone please help me with the answer.

"In an N Channel MOSFET, which terminal is at the most positive voltage when the switch is ON ?"

Thanks kindly.

 

Your title refers to a BJT yet your question is about MOSFETs.

You should be able to find the answer to your question with a bit of web searching using google.

hgmjr

 

sorry, I do mean MOSFET.

I have searched and I think the answer is that the drain is the most positive terminal of a MOSFET both in switch on and switch off position.

Can someone please confirm if I am correct ?

Thanks.

 

I edited the file per you comment.

hgmjr

 

The drain is usually slightly more positive than the source when ON, but I believe you are neglecting how the MOSFET gets turned ON.

 

When an N-ch MOSFET is OFF, the DRAIN is more positive than the source but once the N-ch MOSFET is turned ON, the DRAIN and the SOURCE is ideally shorted. But in reality, when a MOSFET is turned ON, there is a small resistance developed between the DRAIN and SOURCE. This is called the Rdson. There will still be a small voltage drop accross the DRAIN and the SOURCE so for an N-ch MOSFET (ON or OFF) the DRAIN is always more positive than the SOURCE.