28 Fundamentals of Electricity: Unit 28 - Single-Phase Transformers
The industrial use transformer that normally has 240 V or 480 V primary and a 120 V secondary is called a(n) _____ transformer.
control
The transformer that converts a high (7200 V) voltage from the power company down to 120/240 V for homes and businesses is called a _____ transformer.
distributiion
Any transformer flux that does not follow the core and escapes into the surrounding air is called _____.
flux leakage
A transformer in which the primary and secondary are physically separated and not connected by a conductor is called a(n) _____ transformer.
isolation
A transformer in which the secondary voltage is more than the primary voltage is called a _____ transformer.
step up
If the turn ratio is 4 to 1 then the amperage:
4x higher on the primary side
A transformer that does not isolate the out from the input is called a(n) _____ transformer.
auto
A transformer has a 2:1 turns ratio. 120 V is applied to the primary. What is the secondary voltage?
60 V
The amount of current that flows into a transformer primary when voltage is first apllied is called _____ current.
in rush
A transformer supplying a house with 120/240 V has a secondary which is center tapped. The conductor connected to the center is called the _____ conductor.
neutral
The transformer windings which is the power input winding is called the _____ winding.
primary
A transformer in which the secondary voltage is less than the primary voltage is called a _____ transformer.
step down
The transformer winding which is the output winding is called the _____.
step down
The magnetically operated device that can change values of voltage, current, and impedance without changing frequency is the _____.
transformer
A transformer metal toroid is assembled by _____.
winding long tape or metal into a spiral.
Most transformer cores are not made from a solid piece of metal. Instead, they are assembled from many thin sheets of metal. This type of construction is called _____.
lamenated
A transformer tape wound core is assembled by _____.
BLANK
I=
E/Z ohms
Turn ratio can be solved with this formula:
EP/ES = NP/NS