by Jerrry on October 22nd, 2009

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Why is 220 vac more efficient the 120 Vac when dealing with motors. If i ran a pool pump motor at 120 vac and one at 220vac why is the 220 more efficient.

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by douglasmkilmer on October 26th, 2009
The power comsumed by an electric motor is:

P = IE where I is the current and E is the voltage

If you have two motors that are same power, but you run one on 110 VAC and the other on 220 VAC

P is the same for both but, because E is doubled for the 220 VAC motor, then I is reduced by a factor of two.

Losses in the wires connecting to the motor and the wires within the motor depend on the current:

Power lost due to wire resistance = I²R

Where R is the total resistance of the motor windings and the wire that connect to the motor.

Therefore, the losses due to wire resistance is reduced by a factor of 4 on the 220 VAC motor. Less losses means more efficient.
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- Yep, it's the same reason that power is transmitted at high voltage when going long distance - I²R!
  
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  by yeroco on October 26th, 2009
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by qwerty on October 22nd, 2009
it's not more efficent
it will use the same amperage/wattage
it allows for a larger motor the be used and has less wear on the motor being installed
on household ele. you can go up to 20a on a 110 v circuit, you can go 30 or more with 220v
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- actually your wrong, the motor has to work harder on 120vac than it does on 220vac and will use less amps. also runs cooler the amps is what you are charged at the meter. with some electric motors its not by much between the two but over time it will add up. but running your motor cooler will also pay off, will last longer. also you can see power consumption on your motor between the two
  
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  by adcox2 on May 10th, 2011
- If a motor used 15A on 110V circuit it would consume 7.5A per leg on a 220V it's still 15a. It may or may not run cooler depending on the application. It will consume the same power. The real benifit of higher voltage is seen on higher horsepower motors, where the starter and or in rush current make lower voltage motors less desireable. Efficiency does not alwys mean less comsumption. The term also applies to application and the system as a whole
  
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  by qwerty on May 11th, 2011
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You're reading Why is 220 vac more efficient the 120 Vac when dealing with motors. If i ran a pool pump motor at 120 vac and one at 220vac why is the 220 more efficient.

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Why is 220 vac more efficient the 120 Vac when dealing with motors. If i ran a pool pump motor at 120 vac and one at 220vac why is the 220 more efficient.

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Why is 220 vac more efficient the 120 Vac when dealing with motors. If i ran a pool pump motor at 120 vac and one at 220vac why is the 220 more efficient.

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