Quote:
Originally Posted by Ken Fry
An experiment you can do: Run your vacuum cleaner. Put your hand over the end of the hose. The motor speeds up, meaning the the motor is working less. (You can verify this with a watt meter.)
Closing the valves lets the cylinder function as an air spring.
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actually with no air the fan cavitates out.
a better experiment. run your vacuum with an amp meter on the cord.
then plug the inlet until you see 5 mm of vacuum. then read the amp meter.