Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

RT 209 > 4. Transformers > Flashcards

4. Transformers Flashcards

1
Q

changes the intensity of alternating voltage and current by mutual induction

A

Transformer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

is used to change the magnitude of voltage and current in an AC circuit

A

transformer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

a transformer with a turns ratio greater than 1 is a _____ transformer

A

step up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

a transformer with a turns ratio lesser than 1 is a ____transformer

A

step down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

increasing the turns, ______ the voltage but ______ the current

A

increases (v),

decreases (c)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Voltage and turns are _____ proportional

A

directly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Current and turns are _____ proportional

A

inversely

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Power =

A

Power = Voltage x Current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

THE THREE MAIN CAUSES OF TRANSFORMER INEFFICIENCY

A
  • Resistance
  • Hysteresis
  • Eddy currents
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

electric current in the copper wire experiences resistance that results in heat generation

A

Resistance (Copper Losses)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

the alternate reversal of the magnetic field caused by the alternating current causes and additional resistance (electricity induces magnetism)

A

Hysteresis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

these current oppose the magnetic field that induced them, creating a loss of transformer efficiency (magnetic field induces electricity)

A

Eddy Currents

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

TYPES OF TRANSFORMER

A
  • Closed-core transformer
  • Autotransformer
  • Shell-type transformer
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

built about a square core of ferromagnetic material

A

Closed-core transformer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

consists of an iron core with only one winding of wire about it

A

Autotransformer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

based on self-induction rather than mutual induction

A

Autotransformer

17
Q

confines even more of the magnet field lines of the primary winding because the secondary is wrapped around it and there are essentially two close core

A

Shell-type transformer

18
Q

is a device that stores electrical energy in an electric field

19
Q

the relationship between the charge put on the body and its potential

A

Electrical Capacitance

20
Q

charge divided by potential

A

Capacitance (C = Q divide by V)

21
Q

SI unit of capacitance

22
Q

farads=

A

farads= coulombs/volts

23
Q

is to consider capacitance in terms of change of charge divided by the corresponding change in potential

A

Alternative definition of capacitance

24
Q

is the process of converting alternating voltage to direct voltage and therefor alternating current to direct current

A

Rectification

25
Q

inhibits flow of electrons

26
Q

provides electric potential

27
Q

momentarily stores electric charge

28
Q

measures electric current

29
Q

measures electric potential

30
Q

turns circuit on or off by providing infinite resistance

31
Q

increases or decreases voltage by fixed amount (AC only)

A

Transformer

32
Q

variable resistor

33
Q

allows electrons to flow in only one direction

RT 209 (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions