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A transformer steps down voltage from 240 V to 120 V. If the primary coil has 10

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Question: A transformer steps down voltage from 240 V to 120 V. If the primary coil has 100 turns, how many turns does the secondary coil have? (2023)

Options:

  1. 50 turns
  2. 100 turns
  3. 200 turns
  4. 300 turns

Correct Answer: 50 turns

Exam Year: 2023

Solution: 

Using the transformer equation Vp/Vs = Np/Ns, we have 240/120 = 100/Ns, giving Ns = 50 turns.

A transformer steps down voltage from 240 V to 120 V. If the primary coil has 10

Practice Questions

Q1
A transformer steps down voltage from 240 V to 120 V. If the primary coil has 100 turns, how many turns does the secondary coil have? (2023)
  1. 50 turns
  2. 100 turns
  3. 200 turns
  4. 300 turns

Questions & Step-by-Step Solutions

A transformer steps down voltage from 240 V to 120 V. If the primary coil has 100 turns, how many turns does the secondary coil have? (2023)
  • Step 1: Identify the given values. The primary voltage (Vp) is 240 V, the secondary voltage (Vs) is 120 V, and the number of turns in the primary coil (Np) is 100 turns.
  • Step 2: Write down the transformer equation, which relates the voltages and the number of turns: Vp/Vs = Np/Ns.
  • Step 3: Substitute the known values into the equation: 240/120 = 100/Ns.
  • Step 4: Simplify the left side of the equation: 240 divided by 120 equals 2, so we have 2 = 100/Ns.
  • Step 5: To find Ns, rearrange the equation to solve for Ns: Ns = 100/2.
  • Step 6: Calculate the value of Ns: 100 divided by 2 equals 50.
  • Step 7: Conclude that the number of turns in the secondary coil (Ns) is 50 turns.
  • Transformer Basics – Understanding the relationship between voltage and number of turns in a transformer.
  • Voltage Step Down – Recognizing how transformers can step down voltage and the corresponding effect on the number of turns.
  • Transformer Equation – Applying the transformer equation Vp/Vs = Np/Ns to solve for unknown variables.
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