# A step-up transformer has 100 turns on the primary coil and 500 turns on the secondary coil. If there is 120 volts and 10 amps on the primary, what will be the current in the secondary?

$2 A$
The turns ratio is $100 : 500 = 1 : 5$.
This implies that the turns and voltage is stepped up 5 times, as a result the current will be stepped down 5 times and become $\frac{10}{5} = 2 A$.