Question

What is the main formula of transformer?

Answer 1

The main formula for a transformer relates the primary and secondary sides of the transformer in terms of voltage, current, and turns ratio. It can be written as:

1. **Voltage Formula:**
   \[
   \frac{V_p}{V_s} = \frac{N_p}{N_s}
   \]
   Where:
   - \( V_p \) = Primary voltage
   - \( V_s \) = Secondary voltage
   - \( N_p \) = Number of turns in the primary coil
   - \( N_s \) = Number of turns in the secondary coil

2. **Current Formula:**
   \[
   \frac{I_p}{I_s} = \frac{N_s}{N_p}
   \]
   Where:
   - \( I_p \) = Primary current
   - \( I_s \) = Secondary current

These formulas show that the voltage is directly proportional to the turns ratio, while the current is inversely proportional to the turns ratio.

So, if you increase the number of turns on the secondary coil, the secondary voltage increases, and the secondary current decreases, and vice versa.