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Electron Theory > Electron Theory/transformation > Flashcards

Electron Theory/transformation Flashcards

1
Q

Definition of impedance?

A

Total opposition to currant flow

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2
Q

How many watts equal 1 Horse power

A

746w

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3
Q

Each time voltage reverses polarity, the currant flow changes ________

A

Direction

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4
Q

What is frequency measured in?

A

Hertz

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5
Q

During one cycle currant flows in how many directions

A

Two

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6
Q

What is capacitance measured in?

A

Farrads

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7
Q

What is resistance

A

Opposition to the flow of electrons

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8
Q

In a series circuit _____ stays the same

A

Currant

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9
Q

Equation for KVA rating

A

E x I / 1000

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10
Q

Equation for heat loss

A

I squared R

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11
Q

What factors into resistance

A

Size of conductor, length of conductor, type of conductor, Temperature

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12
Q

What is electricity?

A

The flow of electrons through a conductor

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13
Q

What is inductance measured in?

A

Henerys

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14
Q

The volt is the unit of electric pressure expressed in ohm’s law as E for ________?

A

Electromotive force

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15
Q

What is polarity?

A

The direction of currant flow

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16
Q

What is permeability?

A

The ease at which iron conducts magnetic lines of flux.

17
Q

What is inductance?

A

The act of moving or changing the magnetic field to induce voltage into a conductor

18
Q

What is a nuetral?

A

Currant carrying conductor at or near ground potential that acts as a return for unbalanced load

19
Q

What does ohms law state?

A

One volt will push one amp through one ohm

20
Q

What is power (watts)

A

The rate electrical energy is being used

21
Q

What is currant?

A

The flow of electrons

22
Q

What is real power measured in?

A

KW
Kilowatt

23
Q

What is apparent power measured in?

A

KVA
Kilo volt-ampre

24
Q

What is Reactive power measured in?

A

KVAR

25
Q

What is ampacity?

A

The amount of amps that a conductor can carry continuously without exceeding temp rating

26
Q

Amount of currant to fully magnetize the iron core is called?

A

Exciting currant

27
Q

What is a transformer?

A

A ratio device that operates on the principal of mutual induction

28
Q

Transformers which transform electrical energy in any part of the circuit between generation and distribution

A

Power Transformer

29
Q

What is the efficiency of modern day transformers?

A

96%-99%

30
Q

The process of inducing a voltage in a conductor by action of a magnetic field

A

Electro-magnetic Induction

31
Q

Capacitance is measured in what?

A

Farads

32
Q

Farads are a very small unit so line workers use ________________ when around capacitors

A

KVAR

33
Q

What is ferroresonance?

A

An unstable, over voltage condition that can occur when a core is excited.

Electron Theory (1 decks)

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