I am a student of class 12. I am making a transformer for a project. I took an iron rod about 3 inches long and cross sectional area about 0.5 square centimetres as the core. The primary coil has 100 turns and the secondary has 25. I used an ac source of 16 volt. I connected the primary coil to the ac source and measured the voltage across both the primary and secondary coil. I found that voltage across the primary coil is about 2 volt and there is no voltage across secondary coil. I used a multimeter for taking readings. I'm pretty sure I didn't scratch the insulation anywhere in the wires except at the ends, the secondary is insulated from the primary and the primary from the iron core by polyester paper, the coils are wound pretty tight, the ac source and multimeter are fine (I checked), the core gets magnetised, the connections were made well, the resistance of the wires are not that high(primary is about 6 ohms and secondary, about 3)......i can't see where the problem lies. Please help.