A transformer has 200 windings in its primary, which receives 120VAC. The secondary has 400 windings. The voltage across the secondary is _____.

In this scenario, the voltage transformation in a transformer can be determined using the turns ratio of the primary and secondary windings. The transformer has 200 windings in the primary and 400 windings in the secondary. The formula to calculate the secondary voltage based on the primary voltage and the turns ratio is:

Secondary Voltage = (Secondary Windings / Primary Windings) x Primary Voltage

By substituting the known values:

Secondary Voltage = (400 / 200) x 120VAC

= 2 x 120VAC

= 240VAC

Thus, the voltage across the secondary winding is indeed 240 volts. This means that when a transformer has twice as many windings in the secondary section compared to the primary section, the voltage at the secondary will also be double that of the primary input voltage. Consequently, with a primary voltage of 120 volts, the secondary voltage naturally results in 240 volts.