Ch. 10 * (Power Distribution) Flashcards Preview

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Flashcards in Ch. 10 * (Power Distribution) Deck (57)
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0

Electric shock can cause ___

Injury and death

1

Matching waveforms

"In phase"

2

Ohm's law

V = IR

3

V =

Voltage in volts

4

I =

Current in amperes

5

R =

Resistance in ohms

6

Inductive reactance

Magnetic field

7

Capacitive reactance

Electric field

8

Voltage and current in phase

Resistive load

9

Current lags voltage

Inductive circuit

10

Current leads voltage

Capacitive load

11

Power bill =

$99

12

Watt-Hours

Watts X 24 hours X 365 days

13

1 Watt = ___ BTU/hour

3.413

14

AWG sizing system has become generally accepted ___

Worldwide

15

AWG sizes represent ___

Number of steps involved in wire drawing process

16

AWG size range

36 - 4/0

17

Conductor sizes larger than 4/0

Circular Mils

18

Solid-state equipment generally cause ___

Harmonics

19

Swell

Increase

20

Lag

Decrease

21

The N in N+1 = ___

Need

22

Voltage regulators adjust ___

Line voltage

23

Rectifier

Battery charger

24

Types of battery cells

Except "zinc oxide"

25

Battery room considerations

Avoid direct sunlight
Avoid heating/cooling
Near eyewash facility

26

Battery clearance

3.28'

27

Optimal battery temperature

77°

28

Cell of choice for communications

Lead-calcium

29

Most common alkaline cell

NiCd