Root Three

Question 1

You have a wye connected load. The given information is a line-to-neutral voltage and a current magnitude. How would you calculate the three-phase apparent power?

Answer 1

Use the formula:
S3φ=√3×VL×I
(Note: Convert the line-to-neutral voltage to a line-to-line voltage using √3 before calculation)

Question 2

For a wye connected load with given line-to-line voltage and current magnitude, how do you determine the three-phase apparent power?

Answer 2

Use the formula:
S3φ=√3×VL×I
(Note: Convert the line-to-neutral voltage to a line-to-line voltage using √3 before calculation)

Question 3

Given a delta connected load with line-to-line voltage and current magnitude, what formula will you use to find the three-phase apparent power?

Answer 3

Use the formula:
S3φ=√3×VL×I
(Note: Convert the line-to-neutral voltage to a line-to-line voltage using √3 before calculation)

Question 4

For a delta connected load with given phase voltage and current magnitude, how would you calculate the three-phase apparent power?

Answer 4

Use the formula:
S3φ=3×Vph×I
(Note: Convert the line-to-neutral voltage to a line-to-line voltage using √3 before calculation)

Question 5

When working with wye loads and given a line-to-neutral voltage, why is a conversion necessary?

Answer 5

In wye configurations, to get the total three-phase power, you need to work with line-to-line voltages. Convert the line-to-neutral voltage to line-to-line using √3.

Question 6

In delta configurations, when is the square root of three (√3) NOT required for the three-phase power formula?

Answer 6

When you have the phase voltage directly given. Use the formula: S3φ=3×Vph×I