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O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2021 · Q341 Mark

A transformer with an efficiency of 100% has a primary voltage input of 600 V and a secondary voltage output of 240 V. The secondary coil is attached to a resistor of resistance 120 Ω. What is the power dissipated in the resistor and what is the current in the primary coil?

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A120 power/W, 0.20 current/A
B120 power/W, 5.0 current/A
C480 power/W, 0.80 current/A
D480 power/W, 1.3 current/A

✓ Correct answer

C: 480 power/W, 0.80 current/A

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About this question

Topic
Magnetism, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source
O-Level Physics, Oct/Nov 2021 Paper 1 Variant 1, question 34.

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