Characteristics
Secondary winding is physically and electrically isolated from primary
Isolation Transformer
Secondary voltage higher than the primary voltage
Step Up Transformer
_______ core and ______ core are the same
Tape-wound, toroid
How to find turns ratio
Ep(primary)/Ep(secondary)
The ability of one coil to induce a voltage into another coil
Mutual Induction
Single winding transformer
Autotransformer
Most common ________ contains 2 primary windings and 1 secondary
Control Transformer
Often found on high voltage distribution transformers
H-type
Isolation transformers with multiple secondary windings must be _________
treated as different transformers
Power input windings
Primary Winding
Secondary voltage is less that primary voltage
Step Down Transformer
Often used by power companies to provide a small increase or decrease to the line voltage
Autotransformers
Assembled from many thin sheets of metal
laminated
Primary volt-amps if the primary is 240V and the secondary is 120V with a 30 ohm load
3A
Self-induction
coil induces a voltage into itself
Reduces line voltage to the value needed to operate
Control Transformer
designed to deliver a constant output current
Current Regulator
winding a long continuous tape into a spiral
Tape-wound
Primary voltage if the secondary is 120V with a turns ratio of 4:1
480
current that flows when power is initially applied
It is uncommon for isolation transformers to have more than one set of _____
Lead wires
Changes high voltage from the power company to 240/120 V for homes
Distribution Transformer
The amount of core material needed for transformers depends on its ______
Power rating
I= VA/E
maximum current of the primary
Magnetic Materials contain tiny magnetic structures in their molecular material known as
Magnetic Domains