Zusammenfassung der Ressource
Transformers
- How They Work
- (BASIC) A transformer needs an alternating
current to create a changing magnetic
field This changing magnetic field
causes a changing voltage
in a coil.
- Primary coil attached to AC supply
- Alternating current pases through the coil which
is wrapped around an iron core
- This changing current produces a
magnetic field
- This causes a changing voltage in
the secondary coil
- In turn causing an AC in the
circuit attached to the
secondary coil
- These change the voltage of an AC
supply if the transformer increases
voltage its a "step up" if it decreases
voltage its a "step down". They cannot
work with a DC supply.
- IMPORTANT INFORMATION
- There is no electrical connection between
primary and secondary coils.
- Transformers only work if AC is provided to there primary
coil if DC was supplied there would be no current in the
secondary coil
- As current in the primary coil increases or decreases steadily
there is a constant voltage caused in the secondary coil
- As voltage in the primary coil reaches its maximum the voltage in the
secondary coil is at its weakest (zero)