A transformer has 450 turns in its primary coil and 30 turns in its secondary coil. Which one of the following statements concerning this transformer is true?
1) This is a step-up transformer.
2) The turn’s ratio is 15 for this transformer.
3) The ratio of the voltages Vs / Vp is 15 for this transformer.
4) The ratio of the currents Is / Ip is 0.067 for this transformer.
5) The power delivered to the secondary must be the same as that delivered to the primary.