Reply by BlankMan

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Posted on 110 vs 220

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1490 posts in 3917 days

#1 posted 06-13-2011 09:28 PM

Oh there definitely are some advantages of 220V over 110V and it does relate to more power at the blade.

First off, half the voltage, double the current. Double the current the wiring has to carry quadruple the power loss in the wiring. Hence the voltage drop in the wiring reduces the 110V available at the saw to double that of what it would be at 220V. So roughly as an simple example if you’re pulling 10A at 110V and the wiring has a 1 ohm resistance (it’s not this high this is just for example) you lose 10V in the wiring and the saw sees 100V. That same wiring operating at 220V pulling 5A with the wiring having a 1 ohm resistance has a 5V drop across it so the saw sees 215V. (Assuming typical 20A household circuit wired with 12ga wire for both 110V & 220V.) Losses in this example are 9.1% at 110V, 2.3% at 220V and this scales.

This is an exaggerated example and rough calculations (not taking into account it’s actually a divider circuit) to show Voltage does make a difference, the higher the voltage the lower the losses thus more of the power is delivered to the load in this case being the saw. That is why transmission lines are at hundreds of thousands of volts to lower the current thus lowing the losses and delivering more of the power to the load.

And power losses in the wiring produces heat and heat increases the resistances which further increases the losses.

Physics at its best.

Right Topa? And Howdy!

-- -Curt, Milwaukee, WI

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