Question:
A transformer has 120 turns in the primary coil and carries 5A current. Input power is one kilowatt. To have 560 V output, the number of turns in secondary coil will be
A transformer has 120 turns in the primary coil and carries 5A current. Input power is one kilowatt. To have 560 V output, the number of turns in secondary coil will be
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Find the primary voltage from \(P=V_pI_p\), then use the turns ratio.
Updated On: Oct 1, 2026
- \(168\)
- \(200\)
- \(336\)
- \(400\)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
For a transformer \(\dfrac{V_s}{V_p}=\dfrac{N_s}{N_p}\).
Step 2: Key Formula or Approach
Input power \(P=V_pI_p\) gives \(V_p=\dfrac{1000}{5}=200\) V.
Step 3: Detailed Explanation
\[ N_s=N_p\frac{V_s}{V_p}=120\times\frac{560}{200}=336 \]
Final Answer:
The secondary has 336 turns, option (C). \[ \boxed{336\ \text{(C)}} \]
For a transformer \(\dfrac{V_s}{V_p}=\dfrac{N_s}{N_p}\).
Step 2: Key Formula or Approach
Input power \(P=V_pI_p\) gives \(V_p=\dfrac{1000}{5}=200\) V.
Step 3: Detailed Explanation
\[ N_s=N_p\frac{V_s}{V_p}=120\times\frac{560}{200}=336 \]
Final Answer:
The secondary has 336 turns, option (C). \[ \boxed{336\ \text{(C)}} \]
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