Physics for IGCSE & O level - Magnets And Currents (Section 8 - No. 29)
If the number of turns in the primary coil of a transformer is increased, while keeping the number of turns in the secondary coil constant, what will happen to the output voltage?
Increase
Decrease
Stay the same
Become zero
Explication
The output voltage is directly proportional to the ratio of secondary to primary turns. Increasing the primary turns decreases this ratio.