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Flashcards in Ch. 10 - Power Distribution.csv Deck (70)
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2

Measure amplitude

RMS
(10-2)

3

Frequency of electric power =

50 or 60 Hz
(10-3)

4

Two wave forms that match each other in electrical degrees are ________

In Phase
(not out of phase, in sync, etc..)
(10-4)

5

Electrical systems between serving utility & customer site is:

Distribution system
(10-7)

6

V = IR

Ohm's Law
(test)
(10-9)

7

V= I= R=

V= Voltage
I = Amperes
R = Resistance
(10-9)

8

Formula for Ohm's Law always applies to _____.

DC
(test)
(10-10)

9

Z =

Impedance
(test answer)
(10-10)

10

Inductive reactive X =

magnetic field
(10-10)

11

Capacitive reactance X =

electrical field
(10-10)

12

Voltage & Current in phase =

resistive load
(figure 10.9)
(10-11)

13

Current lags voltage =

Inductive circuit
(figure 10.10)
(10-11)

14

Current leads voltage =

Capacitive load
(figure 10.11)
(10-12)

15

Apparant power =

Measured voltage
(10-12)

16

Real power =

Calculation
(10-12)

17

Utility companies charge for power in ________.

Killowatt hours (kwh)
(10-13)

18

One kwh is equal to _________

1000 watt-hours
(10-13)

19

Test question: 1850 watt hours x 24 hours a day x 30 days = 1332.00
1332 x 0.075 = ________

$99 month
(10-13)

20

1 watt = ________ btu/hr

3.413 btu/hr
(10-14)

21

watts x 3.413 =

heat dissipation in BTU
(test)
(10-14)

22

Formula for tons of A/C:

# of watts x 3.413/12000= (answer) tons of A/C
(test)
(10-14)

23

BTU/12000 =

tons of air conditioning
(10-14)

24

AWG accepted =

Worldwide
(10-16)

25

Sizes in the AWG system represent

# of steps
(test)
(10-16)

26

AWG smaller #'s =

larger wires
(10-16)

27

AWG larger #'s =

smaller wires
(10-16)

28

AWG smallest size = ______
largest size = ______

-36 awg
-4/0 = 460 mil
(10-16)

29

Circular mills =

4/0 & above
(10-17)

30

Swell =

increase, 05. cycle - 1 minute
(10-20)

31

Sag =

decrease, 0.5 cycle - 1 minute
(10-20)