The field is created just the same way as an electromagnet, when current flows in the primary coil ![]() Power to Your Home A transformer on a pole “steps down” the voltage from 7200 volts to the 120 volts used in your home.ĭiagram of a transformer A transformer is composed of 3 things ĭiagram of a transformer The primary coil has N1 (or NP) turns (in this case, 4) The secondary coil has N2 (or NS) turns (in this case, 8) The iron core transmits a magnetic field, called “flux” between the two coils. One use of transformers is in the transmission of electrical power to your home. ![]() Every time you plug a cell phone into a wall, you are using a transformer, which “steps down” the voltage from 120 volts to some lower voltage. What is a transformer? A transformer is a device for converting one voltage to another voltage.
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