Question

The charger cord used to recharge a cell phone contains a transformer that reduces 120 v ac to 5v ac, for each thousand turns in the input coil. How many turns are there in the output coil?

Answer 1

E1=120v

E2=5v

n1=1000

n2=?

we know,

E1/E2=n1/n2

so,

120/5=1000/n2

after solving this,

n2= 250/6 which turns out to be 41.66

i.e. 42