A laptop computer requires 24 volts to operate properly. A transformer with 500 turns in the primary needs to have how many turns in the secondary to operate the computer from a 120 V source?

Question

A laptop computer requires 24 volts to operate properly.  A transformer with 500 turns in the primary needs to have how many turns in the secondary to operate the computer from a 120 V source?

Elena · Answer

N1=500, U1 = 120 V, U2 = 24V N2=N1•U2/U1= 500•24/120 =100