In the secondary coil of step-up transformer , the number of turns are ___

Options

A. more and the copper wire is thicker
B. more and the copper wire is thinner
C. less and the copper wire is thicker
D. less and the copper wire is thinner

Answer

**Step-by-Step Solution:**

1. **Understanding the Step-Up Transformer**: A step-up transformer is a device that increases the voltage from the primary coil to the secondary coil. It operates on the principle of electromagnetic induction.

2. **Identifying Coils**: In a transformer, there are two types of coils: the primary coil (input side) and the secondary coil (output side).

3. **Turns in Primary and Secondary Coils**: In a step-up transformer, the number of turns in the primary coil is less than that in the secondary coil. This is because the transformer is designed to increase voltage.

4. **Voltage Relationship**: The relationship between the number of turns and voltage in a transformer is given by the formula:
\[ \frac{V_s}{V_p} = \frac{N_s}{N_p} \]
where \(V_s\) is the voltage in the secondary coil, \(V_p\) is the voltage in the primary coil, \(N_s\) is the number of turns in the secondary coil, and \(N_p\) is the number of turns in the primary coil.

5. **Conclusion**: Since the step-up transformer increases voltage, it must have more turns in the secondary coil than in the primary coil. Therefore, the number of turns in the secondary coil is more.

6. **Final Answer**: The number of turns in the secondary coil of a step-up transformer is more.

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