What is the maximum allowable primary...

What is the maximum allowable primary...

Question 1 of 27070

Q

What is the maximum allowable primary current of a 2 kVA step-down transformer with a four to one turns ratio if the primary is connected across a 440 volt line?

A

1.1 amps

B

4.5 amps

C

18.1 amps

D

27.7 amps

Question 1 / 270705eccefa4bacbc34ba4d48102

Question 1 of 270705eccefa4bacbc34ba4d48102

What is the maximum allowable primary current of a 2 kVA step-down transformer with a four to one turns ratio if the primary is connected across a 440 volt line?

Question 1 of 27070

Study area:

Study area:

Q

What is the maximum allowable primary current of a 2 kVA step-down transformer with a four to one turns ratio if the primary is connected across a 440 volt line?

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🔍 Key Concepts

• kVA rating and current relationship in single-phase transformers • How turns ratio relates to voltage ratio in a step-down transformer • Why the primary current is limited by the kVA rating when connected to a given line voltage

💭 Think About

• First, express 2 kVA in volt-amperes and relate it to voltage and current on the primary side. • Use the relationship S = V × I for apparent power to find the maximum primary current at 440 V. • Consider whether the four to one turns ratio affects the primary current directly or mainly determines the secondary voltage/current.

✅ Before You Answer

• Convert 2 kVA to VA correctly before calculating. • Use the correct voltage (primary 440 V) when computing the primary current. • Confirm that you are using apparent power (VA), not real power (W) in your calculation.