week 2 (chapters 5-6)

Question 1

what are some methods of generation?

Answer 1

steam, hydroelectric, wind, distributed generation, combustion engine.

Question 2

fossil fired, nuclear fired, geothermal, and solar fired generation are all ways of producing __________ for electrical energy?

Answer 2

high pressure steam

Question 3

what are the sources of fossil fuel generation?

Answer 3

coal, petroleum, natural gas

Question 4

the process in which gas is harvested and fired in a combustion turbine, and the exhaust from that turbine makes steam to power a second turbine connected to a generator, is called?

Answer 4

combined cycle generation

Question 5

what percent of todays electrical energy is produced with nuclear generation?

Answer 5

20%

Question 6

what are the two methods of solar generation?

Answer 6

photovoltaic/parabolic trough

Question 7

semi conducting solar panels produce power from direct sunlight in the form of DC, which is then converted

Answer 7

photovoltaic

Question 8

heat energy from the sun heats up salt to a molten state, which passes through a boiler to make steam for electrical energy

Answer 8

parabolic trough

Question 9

dispersed micro generation or _______________ is small scale and normally located at the point of consumption (solar panels)

Answer 9

distributed generation

Question 10

synchronized with the electrical grid to help offset high costs of power during times of peak demand?

Answer 10

distributed generation

Question 11

energy can be converted but in cannot be __________ or ____________

Answer 11

created /destroyed

Question 12

energy in motion is most often seen in _________

Answer 12

electrical motors

Question 13

what does the law of magnetic charges say?

Answer 13

like charges repel/opposites attract

Question 14

in AC circuits, the terms positive and negative refer to _________ in a conductor?

Answer 14

direction of current

Question 15

voltage flowing away from source is _______ and voltage flowing toward it is _________. this is known as ________

Answer 15

positive, negative/polarity

Question 16

strength of voltage produced depends on three factors. what are they?

Answer 16

number of turns in the coil of wire
strength of magnet
speed at which magnetic lines of flux passes the coil

Question 17

a graphical representation of what is happening to voltage in an AC circuit over time is a ?

Answer 17

sine wave

Question 18

is the voltage of a generator that has rotated 90 deg positive or negative?

Answer 18

positive

Question 19

what is the voltage of a generator that has rotated 180 deg?

Answer 19

zero

Question 20

is the voltage of a generator that has rotated 270 deg negative or positive?

Answer 20

negative

Question 21

what is the voltage of a generator that has rotated 360 deg?

Answer 21

zero

Question 22

one rotation of a generator at 360 deg is known as one ______?

Answer 22

cycle

Question 23

_________ is the number of times a generator rotates in one second?

Answer 23

frequency

Question 24

frequency is measured in cycles per second, and is called ______?

Answer 24

hertz

Question 25

60 revolutions per second is also _______? this is the standard for ______ and _______.

Answer 25

60 hertz/ United Utates and Canada

Question 26

how do you calculate instantaneous voltage?

Answer 26

E(inst) = E(max) x Sine

Question 27

E(inst) is the same as saying?

Answer 27

instantaneous voltage, voltage at any point on the waveform

Question 28

E(max) is the same as saying?

Answer 28

maximum or peak voltage

Question 29

Sine < is the?

Answer 29

Sine of the angle of rotation

Question 30

a sine wave has a peak voltage of 7200 volts, what is the voltage after 45 deg of rotation?

Answer 30

use formula: E(inst) = E(max) x Sine< E(inst) = 7200 x sine 45 deg E(inst) = 5091.17 volts

Question 31

a sine wave has a peak voltage of 7200 volts. what is the voltage after 210 deg of rotation?

Answer 31

use formula: E(inst) = E(max) x Sine< E(inst) = 7200 x sine 210 deg E(inst) = 3600 volts

Question 32

DC voltage is one continuous value. it produces a constant amount of power. true or false?

Answer 32

true

Question 33

RMS stands for ?

Answer 33

root mean square

Question 34

the value of AC voltage that will produce the same amount of power as a like value of DC voltage?

Answer 34

RMS (root mean square)

Question 35

RMS values are always _____ than the ______ value?

Answer 35

lower /peak

Question 36

what is the formula to find the RMS value of a sine wave?

Answer 36

RMS = 0.707 x peak voltage

Question 37

how do you find the peak voltage of a sine wave if only the RMS value is known?

Answer 37

Peak = 1.414 x RMS

Question 38

a sine wave has a max voltage of 10,184 volts. what is the RMS value?

Answer 38

``` RMS = 0.707 x peak RMS = 0.707 x 10,184 RMS = 7200 volts ```

Question 39

direct current has a _______ load?

Answer 39

resistive

Question 40

AC circuits have three types of load which are

Answer 40

- resistive - inductive - capacitive

Question 41

if the voltage and current rise and fall at the same time they are ______?

Answer 41

in phase

Question 42

if the voltage and current rise and fall at DIFFERENT times, they are ______?

Answer 42

out of phase

Question 43

a capacitor is added to a circuit to counter (balance out) _______ load?

Answer 43

inductive

Question 44

inductive loads come mostly from what common piece of equipment on the line?

Answer 44

transformers

Question 45

what is the square root of 2? .........used for what?

Answer 45

1.414/used to find peak voltage when RMS is known

Question 46

what is the square root of .5? ........used for what?

Answer 46

.707/ used to find RMS when peak voltage is known

Question 47

how many times does the RMS voltage apear on a sine wave?

Answer 47

4

Question 48

how many times does zero/no voltage appear on the sine wave?

Answer 48

3

Question 49

why is peak voltage not used in an AC circuit?

Answer 49

it is the least amount of available current, only appearing 2 times on the sine wave

Question 50

true power only exists when the load of an AC circuit is purely _______?

Answer 50

restive