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Flashcards in Transformers Deck (38):
1

Worked with electromagnets and discover the property of induction

Jospeh Henry
Michael Faraday

2

Used induction coils in their lighting system

Ganz Company (Budapest, Hungary)

3

Develops his own design of transformer ( Brush Electric Company)

Charles Francis Brush

4

First built a "secondary generator" / step down transformer

Lucien Gaulard
John Dixon Gibbs

5

Suggested the use of closed-cores

Otto Blathy

6

Use of shunt connections

Karoly Zipemowsky

7

Performed the experimemts

Miksa Deri

8

Found out that high voltage circuit work using transformers in parallel

Blathy
Zipemowsky
Deri

9

Orders a siemens alternator

George Westinghouse

10

Makes the transformer more practical to use

William Stanley

11

Changes low voltage into higher voltage or bice versa in AC current

Transformer

12

Coupled conductors

Transformer coils

13

Parts of a transformer

Primary coil
Secondary
Iron core

14

Provides parh for tge magnetic lines of flux

Core

15

Built up of laminated layers of iron

Ferromagnetic core

16

Receives energy from the AC source

Primary winding

17

Receives energy from the primary winding

Secondary winding

18

Protects tge above components from dirt

Enclosure

19

Putting two couls together but not touching produce magnetic field

Inductance effect

20

Property of a circuit wgere enery is stored in tge form of electromagnetic field

Inductance

21

Inductance was discovere by

Joseph Henry and Michael Faraday

22

A changing magbetuc field induces a changing _______

Electromagnetic force / voltage

23

Measure of tge amount of magnetic field passing through

Magnetic Flux/ Magnetic flux density

24

Magnetic flux symbol

Phi

25

Types of transformer

Closed core
Autotransformer
Shell type
Air core
Open core

26

Built with a square core of ferromagnetic material

Closed core

27

Electrical transformer with one winding

Autotransformer

28

Single coil acting on itself

Auto prefix

29

Most efficient type of transformer

Used two closed core

Shell type transformer

30

Does not have a ferromagnetic core to link the prinary and secodary coils

Air core transformer

31

Primary and secondary are wound on one cylindrical core

Highly inefficient

Open core transformer

32

Change in voltage is _________ to the ratio of number of turns

Directlt proportional

33

Turns ratio =

Ns / Np

34

Transformer with a turn ratio greater than 1

Step up transformer

35

Used to produce high kVp for xray

Step up transformer

36

Turns ratio os less than 1

Step down transformer

37

Transformer law

Vs / Vp = Ns / Np

38

Transformer law and current

Is / Ip = Np / Ns
Np/ Ns =1/ TR