What is transformation ratio ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Transformer**:
- A transformer is an electrical device used to change the voltage level in an AC circuit. It can either step up (increase) or step down (decrease) the voltage.

2. **Identifying Turns in the Transformer**:
- In a transformer, there are two coils: the primary coil (input side) and the secondary coil (output side).
- Let \( N_1 \) be the number of turns in the primary coil and \( N_2 \) be the number of turns in the secondary coil.
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