Physics for IGCSE & O level - Magnets And Currents (Section 6 - No. 2)
What will happen in the primary coil of a transformer if the secondary coil circuit is open?
The transformer will not work
The primary coil can burn out
The current in the primary coil will increase
The current in the primary coil will decrease
Explanation
If the secondary is open, the current in the primary coil will decrease.