Associated Builders And Contractors (ABC) Year 1 Practice Test

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The relationship of the number of turns on the ___ as compared to the number of turns on the ___ is called 'turns ratio'.

primary, secondary secondary, primary primary, primary secondary, secondary

Correct Answer:

primary, secondary

Explanation:

Turns ratio is the comparison between the number of turns on the primary winding and the number of turns on the secondary winding. In an ideal transformer, this ratio (Np/Ns) also equals the voltage ratio (Vp/Vs). So describing the turns in the primary relative to the turns in the secondary defines the turns ratio. If the primary has more turns than the secondary, the transformer steps voltage down; if the primary has fewer turns, it steps voltage up. For example, with Np = 200 and Ns = 100, the turns ratio is 2:1, meaning the primary voltage is twice the secondary voltage, and the currents adjust inversely.

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