3-Phase Motor Formula

[jim dungar]

But it isn't.
It's I=W/(V*sqrt(3)*cosφ))
You can't ignore cosφ and get the right answer.
On a lightly loaded motor, the power factor could be 0.5 or worse in which case the current would be double what you would by ignoring pf.

You are correct about the actual formula requiring Power Factor.

However because this is a multiple choice test, and PF was not provided, nor could it be deduced, it cannot be used in determining the answer. If you are going to assume a value, other than 1.0, you might as well just randomly choose any of the provided answers and get on with the rest of the test.

 

[Besoeker]

You are correct about the actual formula requiring Power Factor.

However because this is a multiple choice test, and PF was not provided, nor could it be deduced, it cannot be used in determining the answer. If you are going to assume a value, other than 1.0, you might as well just randomly choose any of the provided answers and get on with the rest of the test.

Unless you can eliminate those that are obviously wrong/impossible - above full load motor current or below the current that must result in a lower power than that given in the question for example.