Why Heat Sink in MOSFET connected to a wire?

dl324

Joined Mar 30, 2015
9,154
With the lack of context you've given us, it's unlikely anyone will be able to give a definitive answer.

As shown, the circuit is worthless because 2 of the three terminals on the MOSFET aren't connected. If they were connected, one of the 3 terminals would be connected to the tab. The wire attached to the heatsink could be making an electrical connection to the tab.

It seems to me that a screw would be a more appropriate fastener than a nail.
 
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