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