If you don't really know then you can use a clamp on amp probe.
If it is cord and plug connected use a adapter like

https://www.amazon.com/Extech-48017...&hvtargid=pla-434793567969&psc=1

Amps-x-volts = watts
Easy peazy

Or you can make one with a male and female cord connector with stranded wire.
Or if you have a old power computer cord just strip off the outer jacket.


There is no such thing as stupid questions.
Just stupid answers.