Transformers

XRay generators use:

Laminated shell type transformers.

Hysteresis (or lagging loss) is:

Occurs because energy is expended due to the changing ACmagnetizing, demagnetizing and re-magnetizing the core material producing heat in the core, thereby wasting electric power.

What is the Transformer Law of EMF?

The EMF in the secondary cil is to the EMF in the primary coil, as the number of turns in the secondary coil is to the number of turns in the primary coil.

Step down transformers:

Are the result of voltage decrease from the primary to the secondary coil

Step up transformers:

Are the result of voltage increase from the primary to secondary coil.

Primary and secondary coils in a transformer are designed to be:

Different in number of turns

Copper loss is also known as:

I^2R loss

A Shell-Type transformer:

Primary and secondary coils are wound atop one another and around the central sectionof the core for maximum efficiency

AC which continually changes direction and magnitude:

Produces a magnetic field that is also continually changing

What is transformer efficiency?

The ability of a transformer to avois power loss

Transformers are composed of:

2 coils placed near one another but without electrical connection

How many types of power loss are there?

3

How many types of Transformer constructions are there?

4

The efficiency of a transformer is more likely to be:

95% or more

A transformer is:

A device that changes the magnitude of voltage and current in an AC circuit

What are the 4 types of transformer construction?

Air Core, Open core, Closed core and Shell-type.

What is Copper Loss:

Caused by the inherent resistance to current flow that is found in all cinductors. Power lost due to resistance is proportional to the square of the current.

An air core transformer:

Consists of 2 coils in proximity to facilitate induction.

The Transformer Law of Current and Number of turns states:

Current is inversely proportional to the number of turns.

A Closed core transformer:

Directs lines of force from the primary to the secondary cores toward each other and result in significant increases in field strength.

Eddy Copper loss is produced:

In any conducting material subjected to changing magnetic field.

The primary coil is the:

Input side that is connected to the source supplied with AC

What is the Transformer Law of Current and Number of Turns?

Ip/Is=Ns/Np

What is the Transformer Law to Current Equation?

Ip/Is=Vs/Vp

What will reduce Eddy Current?

Laminating the transformer core by dividing it into thin insulated laminations.

The secondary coil is:

The output side that develops AC by mutual induction

Tranformer Law to Current states:

The power output can be no greater than the power input.

An Open core transformer:

The primary and secondary coils are filled with an iron core causing the strength of the magnetic field to increase induction.

What is Eddy copper loss:

The result of currents opposing the cause which produced them in accordance with Lens Law. These useless currents produce heat in the core.

Lagging loss is reduced by:

Using a laminated silicon core.

What reduced Copper loss:

Using low resistance, large diameter copper wire.

What is the Transformer Law of EMF Equation?

Vs/Vp=Ns/Np