In a step - down transformer, the number of turns in

Options

A. (a)primary are less
B. (b)primary are more
C. (c)primary and secondary are equal
D. (d)primary are infinite

Answer

To solve the question regarding the number of turns in a step-down transformer, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Function of a Step-Down Transformer**:
A step-down transformer is designed to reduce the voltage from the primary side to the secondary side. This means that the voltage on the secondary side (Vs) is less than the voltage on the primary side (Vp).

2. **Using the Transformer Equation**:
The relationship between the primary voltage (Vp), secondary voltage (Vs), number of turns in the primary coil (Np), and number of turns in the secondary coil (Ns) is given by the formula:
\[ \frac{Vp}{Vs} = \frac{Np}{Ns} \]

3. **Analyzing the Relationship**:
Since we know that in a step-down transformer, the secondary voltage (Vs) is less than the primary voltage (Vp), we can conclude that:
\[ \frac{Vp}{Vs} > 1 \]
This implies that:
\[ \frac{Np}{Ns} > 1 \]
Therefore, the number of turns in the primary coil (Np) must be greater than the number of turns in the secondary coil (Ns).

4. **Conclusion**:
From the analysis, we conclude that in a step-down transformer, the number of turns in the primary coil (Np) is greater than the number of turns in the secondary coil (Ns). Thus, the correct answer to the question is that the number of turns in the primary is more.

### Final Answer:
The number of turns in the primary coil of a step-down transformer is **more**.