The transformer ratio of a step up transformer is

Options

A. greater than one
B. less than one
C. less than one and some times greater than one
D. greater than one and some times less than one

Answer

To determine the transformer ratio of a step-up transformer, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Transformer Basics**:
- A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.
- It consists of primary and secondary coils (windings).

2. **Defining Transformer Ratio**:
- The transformer ratio (also known as turns ratio) is defined as the ratio of the voltage across the secondary winding (Vs) to the voltage across the primary winding (Vp).
- Mathematically, this is expressed as:
\[ \text{Transformer Ratio} = \frac{V_s}{V_p} \]

3. **Step-Up Transformer Characteristics**:
- A step-up transformer increases the voltage from the primary to the secondary winding.
- In a step-up transformer, the number of turns in the secondary winding (Ns) is greater than the number of turns in the primary winding (Np).

4. **Implication of Step-Up Transformer**:
- Since the secondary voltage is greater than the primary voltage in a step-up transformer, we have:
\[ V_s > V_p \]
- This implies that:
\[ \frac{V_s}{V_p} > 1 \]

5. **Conclusion**:
- Therefore, the transformer ratio of a step-up transformer is greater than 1.

### Final Answer:
The transformer ratio of a step-up transformer is greater than 1.

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