My new cell phone requires 9 volts to operate correctlyA transformer nicely allows the device to be powered from a 120 volt outlet. If the primary has 120 turns, how many turns should the secondary have?

Does a transformer work when a DC current flows through the primary? If not, why?

QUESTION 7 The primary of a transformer has 120 turns, while the secondary of the same transformer has 300 turns. If the primary receives a current of 20 A from an external power source, what will be the current in the secondary? О а. 12 А O b. 10 A О с. 8.0 А O d. 14 A О е.6.0А

imer Notes EV A transformer has 400 primary, and 80 secondary, turns. If an alternating potential of 250 V is applied to the primary, what potential is produced across the secondary? V