Discussion
The burden of a current transformer is quoted as 15 VA at 5 A. Its impedance is
Answer: C
Correct answer: 0.6 \( \Omega \)
Burden in volt-amperes converts to impedance through the rated secondary current: \[ Z = \frac{VA}{I^{2}} = \frac{15}{5^{2}} = \frac{15}{25} = 0.6\ \Omega. \] Dividing by the current rather than its square gives the 3 ohms offered, and the square is what makes the next two items behave as they do.
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