Electrician's Licensing Practice Exam

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Prepare for the Electrician's Licensing Test with comprehensive multiple choice questions and hints. Improve your knowledge, skills, and confidence to excel in your exam!

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If a transformer has a voltage ratio of 8:1 and an input voltage of 120V, what will be the output voltage?

15 volts
30 volts
60 volts
120 volts

The correct answer is: 15 volts

To determine the output voltage of a transformer with a voltage ratio of 8:1 and an input voltage of 120V, you can utilize the relationship defined by the voltage ratio. In a transformer, the voltage ratio indicates how the voltages are related between the primary (input) and secondary (output) windings. With a voltage ratio of 8:1, this means that for every 8 volts in the primary winding, there is 1 volt in the secondary winding. Therefore, when you have an input voltage of 120V, you can calculate the output voltage by dividing the input voltage by the voltage ratio (8). This calculation would be: Output Voltage = Input Voltage / Voltage Ratio = 120V / 8 = 15V. Thus, the output voltage of the transformer is indeed 15 volts.