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General Safety > Basic Electricity > Flashcards

Basic Electricity Flashcards

1
Q

AC is the term that refers to a current that ______ at regular intervals of time and that has altermatelt ____________ and _________ values.

A

reverses, positive, negative

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2
Q

DC is a term that refers to current that flows in _____ direction

A

one

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3
Q

Batteries produce _______ current through chemical reaction

A

direct

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4
Q

Power system generators produce _______ current by cuting lines of magnetic force with a rotating conductor

A

alternate

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5
Q

One complete AC wave is called a?

A

Cycle

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6
Q

The acronym for alternating current is?

A

AC

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7
Q

The acronym for direct current is?

A

DC

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8
Q

The power grid in the USA operates the ____ system at ____ cycles by design.

A

AC, 60

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9
Q

In a 60hz system, AC completes 60 cycles in…

A

one second

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10
Q

The acronym CPS in an AC circuit stands for?

A

cycles per second

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11
Q

one compete AC cycle is equivalent to _____ degrees.

A

360

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12
Q

AC three phase power originates from the power plant _______

A

generator

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13
Q

AC three phase rotation originates from the power plant _______

A

generator

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14
Q

DC power _____ be connected directly to the AC power grid.

A

cannot

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15
Q

DC power can be converted to AC power through a device called an?

A

inverter

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16
Q

AC power can be converted to DC power through a device called an?

A

rectifier

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17
Q

AC circuits have an _______ sine wave and _____ since wave.

A

AC and voltage

18
Q

AMPs are the measure of electical _______.

A

current

19
Q

The symbol for current is?

A

I

20
Q

The opposition of current flow, which converts electic energy into heat is called?

A

resistance

21
Q

The symbol of resistance is?

A

R

22
Q

The practical unit of electical pressure that will produce a current of one amp against a resistance of one ohm is called a what?

A

Volt

23
Q

The symbol for voltage is?

A

V

24
Q

What are the primary components of impedance?

A

inductive reactance, capacitive reactance and resistance

25
Q

What is the symbol of impedance?

A

Z

26
Q

The oppostion offered to the flow of AC by the inductance or capacitance of a part is called______ and is measured in ______?

A

reactance, ohms

27
Q

The process by which an electrical conductor becomes electified when near a separate charged body’s magnetic field is called?

A

inductance

28
Q

What is the square root of 3?

This value is used to convert single phase voltage to 3 phase voltage

A

1.732

29
Q

When the condition across an open circuit is such that the voltage sine wave on one side matches the voltage sine wave on the other side in frequency and without phase angle difference with respect to all respective AC phases, the systems are considered to be in__________?

A

synchronization

30
Q

Apparent power consists of _____ power and _______ power and is expressed in ________.

A

active, reactive, MVA

31
Q

Reactive power is expressed as ______ and ________ do real work.

A

VAR, does not

32
Q

The number of cycles occurring in a given of time in an electric current is called?

A

Frequency

33
Q

The expression of cycles per second is commonly termed?

A

Hertz

34
Q

MW is________?

A

directional

35
Q

MVAR is ______?

A

directional

36
Q

AMPS are________?

A

bi-directional

37
Q

Amps are measured in normal AC power grids, expressed in the form of a total current value, inlcude both ______ and ______ amps

A

active and reactive

38
Q

Can reactive amps overload a facility, since they do not do real work?

A

Yes

39
Q

MVAR flows from the stronger _______ source ot eh weaker ________ source regardless of _______ transformation

A

MVAR, MVAR, Voltage

40
Q

MVAR flows from the _________ source to the ________ sink

A

voltage, voltage

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