Discussion
A wattmeter reads 120 W through a 200/5 current transformer and a 6600/110 potential transformer. The power in the primary circuit is
Answer: B
Correct answer: 288 kW
Both ratios multiply the wattmeter reading, since power is the product of current and voltage: \[ 120 \times \frac{200}{5} \times \frac{6600}{110} = 120 \times 40 \times 60 = 288{,}000\ \mathrm{W} = 288\ \mathrm{kW}. \] Applying only one of the two ratios gives 4.8 kW or 7.2 kW, both of which are offered here.
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