In article , John
Rumm writes
The Natural Philosopher wrote:

A very high efficiency motor can draw HUGE startup currents quite out of
proportion to its actual running current, and its also instructivce to
see whether its input or output ower being quoted.

A cheap electriv motor may lose up to 40% of the power - or more. A good
one can be 95% efficient.

Something to bear in mind next time someone starts a cheap power tool
thread! It is not only the motor losses that add up, there are also the
mechanical ones in poorly made gearboxes etc. The upshot of which is
that if input power is being quoted, the tool may perform way below the
expectation that would be given from the numbers alone (PPPoo tools
anyone?).

Yes and what a heap of dung they are. Never buying another one;(((


--
Tony Sayer