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Kansas Electrical Prep > Master Electrician > Flashcards

Master Electrician Flashcards

1
Q

What is an ampere?

A

The unit of current measurement. The amount of current that will flow through a one ohm resistor when one volt is applied

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2
Q

How do you find Power?

A

Power(P) = Current(I)x Volts(E)

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3
Q

How do you find Current?

A

Current(I)=Power(P) / Volts(E)

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4
Q

How do you find Volts?

A

Volts(E)= Power(P)/ Current(I)

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5
Q

I stands for?

A

I = Amperes or Current draw on the load

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6
Q

E stands for?

A

E = Volts

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7
Q

kVA stands for?

A

kVA = Kilovolt-Amperes

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8
Q

PF stands for?

A

PF = Power Factor

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9
Q

HP stands for?

A

HP = horse power

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10
Q

VA stands for?

A

VA = Power

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11
Q

W stands for?

A

W = Watts

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12
Q

Pf stands for?

A

Pf = Power Factor

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13
Q

How do you find VA (power)?

A

VA = W watts/Pf power factor

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14
Q

Ohms Law Circle Formula uses what 3 letters?

A

E. I. R. E(Voltage). I(Current). R(Resistance)

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15
Q

Power Circle Formula uses what 3 letters?

A

P. I. E. P(power) I(Current). E(Volts)

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16
Q

Power Factor Triangle uses what 3 letters?

A

W. VA Pf. W(watts). VA(Power). Pf(Power Factor)

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17
Q

How do you find Resistance?

A

Resistance(R) = (E)Voltage/(I)Current

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18
Q

How do you find Current?

A

Current(I) = (E)Voltage/(R) Resistance

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19
Q

How do you find Voltage?

A

Voltage(E) = (I)Current x (R) Resistance

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20
Q

What is the multiplying factor(number) consistently used in three phase formulas?

A

1.732

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21
Q

How do you find Watts?

A

Watts(W) = VA (Power) x Pf (Power Factor)

22
Q

How do you find Pf?

A

Power factor(Pf) = (W)Watts / (VA) Power

23
Q

VD stands for?

A

VD = Volts dropped from a circuit

24
Q

What is the multiplying factor for a single phase circuit?

A

2, The 2 represents the conductor length in single-phase circuits

25
Q

What does D stand for?

A

D = The distance from the source voltage to the load

26
Q

What does K stand for?

A

K = is the resistivity of the conductor per mil foot. A mil foot is a wire 1 foot long and one mil in diameter.

The K value of Copper - 12.9 ohms per mil foot
The K value of Aluminum - 21.2 ohms per mil foot

27
Q

What is the K value of Copper per mil foot?

A

12.9 ohms

28
Q

What is the K value of Aluminum per mil foot?

A

21.2 ohms

29
Q

What is the formula to find voltage drop in a single phase circuit?

A

VD = 2 x K x I x D / CM

30
Q

What does CM stand for?

A

Circular mil area of a conductor (refer to chapter 9/table 8)

31
Q

How do you find wire size in a single - phase circuit? (formula)

A

D = CM x VD / 2 x K x I

32
Q

How do you find the MAXIMUM current in amperes in a single - phase circuit? (formula)

A

I = CM x VD / 2X K X D

33
Q

One kW equals how many watts?

A

1000

34
Q

One kVA equals how many volt-amps

A

1000

35
Q

One horse power equals how many watts?

A

746

36
Q

What is the formulas used to determine the available power for a single phase circuit, load, or an electrical system?

A 
P = I x E
P = current x volts
P = volts x amps
37
Q

Current can be expressed as …

A 
as the letter I and as...
amps
amperes
full-load current
amperage
amperage draw
line load
FLC
FLA
full load amps
38
Q

Power factor is the ratio between true power expressed and ___________?

A 
watts,
kilo watts
kW
volt-amps
VA
kVA
39
Q

True power (watts) EQUAL to apparent power (VA) in …..

A

an electric circuit or load containing ONLY resistance

40
Q

True power (watts) is LESS than apparent power (VA) in a circuit or load containing …

A

inductance or capacitance, such as motor, transformers, HID and florescent lighting

41
Q

What is the definition of a CONTINUOUS load?

A

Where the maximum current is expected to continue for 3 hours or more

42
Q

Examples of a continuous load are …..

A

Lighting loads (commercial and industrial occupancies) expected to operate for 3 hours or more.

43
Q

Branch circuit conductors shall have an allowable ampacity of NOT less that …

A

125% of the continuous load, plus the 100% of the non-continuous load

44
Q

How is the rating of a branch circuit determined?

A

By the maximum ampere rating of the overcurrent protective device (circuit breaker or fuse) and NOT by the size of the conductors used for the branch-circuit

45
Q

True or False: Circuit breakers are NOT listed for continuous operation, unless they have a rating of at least 400 amperes or more.

A

True

46
Q

True or False: In general, lighting loads are to be supplied by 15- and 20- ampere rated branch circuits

A

True

47
Q

True or False: Overcurrent devices protecting branch circuits are not to be loaded more than 70% of their rated value when protecting continuous loads.

A

False - 80%

48
Q

When calculating lighting loads for dwelling units DO NOT include…

A

open porches, garages, or unfinished spaces not adaptable for future use.

49
Q

True or False: Lighting loads for habitable spaces of dwelling units and guest rooms and hotels and motels are considered as continuous use.

A

FALSE - guest rooms and hotels and motels are NOT considered as continuous use BUT lighting loads of commercial and industrial occupancies ARE considered as continuous.

50
Q

True or False: Multifamily condo without a cooking facility is calculated at the same 2 VA per square foot as hotels and motels when determining the minimum general lighting branch-circuits.

A

True

Kansas Electrical Prep (6 decks)

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