Flashcards in Transformers Deck (5)
What happens if a wire cuts through a magnetic field?
potential difference is induced across the ends of the conductor
if the wire is part of a complete circuit an electric current will flow in the circuit
What does an a.c. in the primary coil of a transformer produce?
it produces a changing magnetic field in the iron core, and hence the secondary coil
this induces an alternating potential difference across the ends of the secondary coil
What happens in a step-up transformer?
the p.d. across the secondary coil is greater than the p.d. across the primary coil
the opposite happens with a step-down transformer
What happens if a transformer is 100% efficient?
the electrical power output would equal the power input