Week 1 (chapter 1)

Question 1

what are the three key elements a circuit needs to be able to function?

Answer 1

voltage (source of electrical pressure)
conductor
load

Question 2

conductors must form a _____ _______ for current to flow?

Answer 2

complete path

Question 3

without a complete path, electrons are unable to flow through a conductor; this is known as?

Answer 3

an open circuit

Question 4

if a load in the system is not present or has been bypassed, it is called a?

Answer 4

short circuit

Question 5

what is designed as an intentionally weakened point in the circuit to burn open when current becomes excessive?

Answer 5

fuse

Question 6

fuses are connected in _____ with a load so the circuit will open if current rating is exceeded

Answer 6

series

Question 7

does a short circuit have high or low resistance?

Answer 7

low

Question 8

fuses are designed to melt at ____ amperages than the conductor, thereby protecting it.

Answer 8

lower

Question 9

what are the two basic types of circuits?

Answer 9

series and parallel

Question 10

all circuits are either _____, ______ or __________?

Answer 10

series, parallel, or a combination of the two

Question 11

what type of circuit only has ONE path for current to flow?

Answer 11

series

Question 12

because there is only one path for current to flow in a series connected circuit, current is ________ at any point in the circuit.

Answer 12

constant (the same)

Question 13

In what application would you commonly see a circuit wired in series?

Answer 13

lighting

Question 14

parallel circuits have _______ paths for current to flow?

Answer 14

multiple

Question 15

what is a combination circuit?

Answer 15

one wired in series AND parallel

Question 16

anything connected directly across two points of different potential are _________?

Answer 16

in series

Question 17

any conductor, including the human body, that is connected in series will have current pass through it unless?

Answer 17

there is enough resistance to prevent it.

Question 18

line workers should never put them selves in what position, even with protective gear?

Answer 18

in series, between two points of different potential

Question 19

a recloser is in line with the source so it has all the current passing through it. this is done so the recloser can ______ _____ ______ and open up to protect the circuit

Answer 19

sense excess(fault) current

Question 20

when protection devices, such as reclosers or sectionalizers are connected in series with the line, they will have ______ __ _________ running through them.

Answer 20

all the current

Question 21

in a series circuit, _____ will drop across each ________ that is connected in the circuit.

Answer 21

voltage/resistance

Question 22

power lines are considered ___________ type circuits because the EQUIPMENT that is connected in series with the line; however, the LAYOUT of the circuit is predominately ____________?

Answer 22

combination/parallel

Question 23

sub-transmission substations are _________ to the transmission line

Answer 23

parallel

Question 24

parallel circuits are distinguished by the fact that the electrical values seen by the source are ?

Answer 24

dependent upon the individual loads

Question 25

distribution sub-stations are ______ to the sub-transmission lines.

Answer 25

parallel

Question 26

are customer circuits parallel or series?

Answer 26

parallel

Question 27

for a customer circuit, the source is at the _____ _____ and the load is at all the ________?

Answer 27

meter panel/appliances

Question 28

voltage in a parallel circuit remains constant, while the _________ changes at different points in the circuit

Answer 28

current

Question 29

as devices are added to the line, current flow through the conductors will ______.

Answer 29

increase.

Question 30

in a series circuit, resistance equals the ?

Answer 30

sum of all the resistors

Question 31

when you see a test question with a value expressed in kVA, what does this represent?

Answer 31

watts (use the power quadrant in the energy wheel)

Question 32

in a parallel circuit, the applied voltage is the same for all resistors. what is the voltage drop across EACH resistor?

Answer 32

equal to the applied voltage. (for instance, 120 volts from source and zero volts return. all voltage is used up per each resistor)

Question 33

in a series circuit, how can you check to see if your voltage drops are calculated correctly?

Answer 33

the total voltage drops across all the resistors should equal the applied voltage from source.

Question 34

three lights are on the same 24 volt circuit, the middle light is out and the other two are lit. what type of circuit is this?

Answer 34

parallel

Question 35

a 24 volt circuit has three, 60 watt light bulbs wired in series. How much current is on the circuit?

Answer 35

answer = 7.5 amps
use ….. I = P/E
P = 180 (total power in watts on the circuit)
E = 24
I = 7.5 amps
*check answer by calculating voltage drop across each resistor using the amperage that was found, (E = P/I) then add all the voltages and compare to the source voltage! if they match you are correct.