Physics for IGCSE & O level - Magnets And Currents (Section 11 - No. 1)
What is the relationship between the primary and secondary coils in a transformer?
They are electrically isolated but magnetically linked.
They are directly connected by wires.
They are mechanically linked.
They have the same number of turns.
Giải thích
They are linked through a magnetic field, but not direct wires.