Alternating Current: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Alternating Current. Understanding the underlying formula is key to arriving at the correct answer below:

For an ideal transformer, the current ratio is inversely proportional to the turns ratio: $\frac{I_p}{I_s} = \frac{N_s}{N_p}$.
The step-up turns ratio is $N_p : N_s = 1 : 25$, so $\frac{N_s}{N_p} = 25$.
Primary current $I_p = I_s \times 25 = 2 \times 25 = 50 A$.