Question 1 of 292185eccefa4bacbc34ba4d480f6

The turns ratio of the tapped step down transformer shown in figure "C" of the illustration is four to one and all the taps are equally spaced. If 120 volts was measured across the secondary between 'X1' and 'X2', what voltage must be applied across 'H1' and 'H4'? See illustration EL-0082.

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Question 1 of 29218
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The turns ratio of the tapped step down transformer shown in figure "C" of the illustration is four to one and all the taps are equally spaced. If 120 volts was measured across the secondary between 'X1' and 'X2', what voltage must be applied across 'H1' and 'H4'? See illustration EL-0082.

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🔍 Key Concepts

• Transformer turns ratio and how voltage relates to turns (Vp/Vs = Np/Ns) • What it means when all taps are equally spaced on a winding • Difference between the full secondary winding voltage and the voltage between two adjacent taps

💭 Think About

• First, decide what fraction of the entire secondary winding you are using when you measure between X1 and X2 on figure C. Is it the whole winding or only part of it? • Once you know that fraction, figure out what the full-secondary voltage would be between X1 and X4 if 120 V appears between X1 and X2. • Then, apply the 4:1 turns (and voltage) ratio between the primary (H1–H4) and the full secondary to find the primary voltage.

✅ Before You Answer

• Be sure you clearly identify which terminals represent the ends of the full secondary and which are just taps. • Confirm that the turns ratio applies to the entire primary vs. the entire secondary, not just a tapped section. • Double-check your fractional step: if the taps are equally spaced, decide how many equal sections the secondary has and what multiple of 120 V gives the full-secondary voltage.