Here's how to calculate the secondary voltage of a transformer:

Understanding Transformer Voltage Ratios

A transformer's voltage ratio is directly proportional to the number of turns in its windings. The formula is:

* V_p / V_s = N_p / N_s

Where:

* V_p = Primary voltage

* V_s = Secondary voltage

* N_p = Number of turns in the primary winding

* N_s = Number of turns in the secondary winding

Solving the Problem

1. Given:

* V_p = 120 volts

* N_p = 200 turns

* N_s = 20 turns

2. Solve for V_s:

* (120 volts) / V_s = (200 turns) / (20 turns)

* 120 / V_s = 10

* V_s = 120 / 10

* V_s = 12 volts

Therefore, the secondary voltage of the transformer is 12 volts.