National League for Nursing (NLN) Science Practice Exam

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A 110-volt hair dryer delivers 1,525 watts of power. How many amperes does it draw?

167,750 amperes
1,635 amperes
1,415 amperes
13.9 amperes

The correct answer is: 13.9 amperes

To determine how many amperes the hair dryer draws, you can use the formula that relates power (watts), voltage (volts), and current (amperes): Power (P) = Voltage (V) × Current (I) Rearranging this formula to find the current gives: Current (I) = Power (P) / Voltage (V) Using the information provided, the power is 1,525 watts and the voltage is 110 volts. Plugging these values into the rearranged formula gives: I = 1,525 watts / 110 volts Calculating this results in: I = 13.875 amperes When rounded to one decimal place, this value is approximately 13.9 amperes. This demonstrates that the hair dryer draws a current of about 13.9 amperes when operating at 110 volts and delivering 1,525 watts of power. Understanding the relationship between power, voltage, and current is crucial in electrical systems, as it helps ensure devices are used safely and effectively without exceeding their electrical capacities.