Voltage question

Question

If you are designing a transformer for a cell phone charging cable and need to step down the voltage from the primary coil to the secondary by half, which coil should have more turns?

A. The primary coil should have more turns

B.  he secondary coil should have more turns

C. The two coils should have the same number of turns

Answer 1

In order to step down the voltage, the output (secondary) coil must have fewer turns than the input (primary) coil. The correct answer is (A) the primary coil should have more turns.