Question 1 of 27070
Q
A 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its primary current?
A
11.36 A
B
14.2 A
C
45.45 A
D
56.82 A
Question 1 / 270705eccefa4bacbc34ba4d4812d
Question 1 of 270705eccefa4bacbc34ba4d4812d

A 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its primary current?

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Question 1 of 27070
Q

A 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its primary current?

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🔍 Key Concepts

• Single-phase power formula: relationship between real power (kW), voltage (V), current (A), and power factor (pf) • Difference between primary voltage and secondary voltage of a transformer • How to rearrange the power formula to solve for current when power, voltage, and pf are known

💭 Think About

• Which side of the transformer (440 V or 110 V) is supplying the 5 kW load, and which side’s current is the question asking for? • Write the formula for current in a single‑phase AC circuit when you know power, voltage, and power factor. Plug in the numbers carefully and check the units. • After finding the current on one side, think about whether you need to use the voltage ratio to relate primary and secondary currents.

✅ Before You Answer

• Confirm which is the primary voltage (440 V) and which is the secondary voltage (110 V). • Use the correct single‑phase power formula: P=VIpfP = V I \text{pf}P=VIpf and solve correctly for III. • Check if the current you calculated matches a reasonable magnitude for a 5 kW load at the given voltage before comparing to the answer choices.