Question 521Electricity & Electronics - QMED

The correct answer is B) 4.5 amps. To arrive at this answer, we can use the formula for power, voltage, and current in a transformer: Power (P) = Voltage (V) x Current (I) Since the transformer is step-down with a 4:1 turns ratio, the primary voltage is 440V and the secondary voltage is 440V / 4 = 110V. The power rating of the transformer is 2 kVA, which is equivalent to 2000 watts. Rearranging the power formula, we can solve for the primary current: I = P / V I = 2000 watts / 440 volts I = 4.5 amps The other answer choices are incorrect because: A) 1.1 amps is too low for a 2 kVA transformer on a 440V line. C) 18.1 amps is too high for a 2 kVA transformer on a 440V line. D) 27.7 amps is also too high for a 2 kVA transformer on a 440V line.