Transformers

Transformers

Step up transformers - step up voltage, have more turns on secondary coil than primary

Step down transformers - step down voltage, more turns on primary coil than secondary

Work by electromagnetic induction:

• Primary coil produces a magnetic field which stays within the iron core, meaning nearly all of it passes through to secondary coil
• Because AC in the primary coil, the field in the iron core is constantly changing direction - changing magnetic field
• This is felt by secondary coil
• Induces an alternating voltage in secondary coil (same frequency as in primary) - electromagnetic induction
• Relative no. of turns on the coils determines whether voltage induced in the secondary is greater or less than in the…