1. An alternating current flows through the primary coil, 2. This creates a magnetic field around the primary coil, 3. This magnetic field is growing and collapsing as the current increases and decreases, 4. The soft iron core magnetically links the primary coil to the secondary coil, 5. The growing and collapsing magnetic field cuts through the secondary coil, 6. An alternating current is induced in the secondary coil.

How does a transformer work?

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