Ch 3

Question 1

In a parallel circuit, the total power is equal to what?

Answer 1

The sum of the branches’ powers

Question 2

What can happen if the neutral conductor of a multi-wire circuit is interrupted (opened)? Why?

Answer 2

Fire or destruction of equipment, because it can cause overvoltage or undervoltage of the electrical equipment.

Question 3

The current flowing in the neutral conductor of a multi-wire circuit is called:

Answer 3

Unbalanced Current

Question 4

The neutral conductor of a 3-wire, 120/208V or 277/480V circuit from a 4-wire, three phase system will ______ carry neutral current

Answer 4

Always

Question 5

In a parallel circuit, the resistance total is _____ than the smallest individual resistance

Answer 5

Less

Question 6

This type of circuit is also called “Open-loop system”

Answer 6

Parallel

Question 7

What is the formula for the Product-Over-Sum Method?

Answer 7

Rt = (R1 x R2) / (R1 + R2)

Question 8

This conductor is also called a “grounded conductor”

Answer 8

Neutral

Question 9

In a series circuit, what does the sum of the power consumed by all the resistors equal?

Answer 9

The total power consumed by the circuit

Question 10

(Series or Parallel) Total power is equal to the sum of the branches’ powers

Answer 10

Parallel

Question 11

The _______ conductor or a solidly grounded system is required to be grounded.

Answer 11

Neutral

Question 12

(Series or Parallel) Total resistance is less than the smallest individual resistance

Answer 12

Parallel

Question 13

Term for “connected to the Earth”

Answer 13

Grounded

Question 14

Because of the dangers of an open neutral conductor, what does the NEC require in a multi-wire circuit?

Answer 14

That the neutral be spliced and brought out to the device. This way if the device is removed, it does not result in an open neutral conductor.

Question 15

Circuit consisting of two or more ungrounded conductors that have a voltage between them, and an equal voltage between each ungrounded conductor

Answer 15

Multi-wire Circuit

Question 16

Current is identical through all circuit elements in this type of circuit

Answer 16

Series

Question 17

In a 3-wire 120/240V, single-phase circuit, the current flowing on the neutral will be what?

Answer 17

The difference between the current on the ungrounded conductors

Question 18

When power supplies are connected in series, the voltage of the power supply will be ________

Answer 18

Additive

Question 19

(Series or Parallel) The sum of the currents through each path is equal to the total current that flows from the source

Answer 19

Parallel

Question 20

In a parallel circuit, voltage is ____ across each component of the parallel circuit?

Answer 20

The same

Question 21

In a parallel circuit, the sum of the currents through each path is equal to what?

Answer 21

The total current that flows from the power source

Question 22

In a multi-wire branch circuit, what could cause the neutral to become overloaded with current and damage the insulation?

Answer 22

Not terminating the ungrounded conductors to separate phases

Question 23

(Series or Parallel) Current is constant

Answer 23

Series

Question 24

(Series or Parallel) Total resistance of a series circuit is equal to the sum of all of the resistances of the circuit

Answer 24

Series

Question 25

What is the formula for the Reciprocal Mehtod?

Answer 25

Rt = 1 /(1 /R1, + 1/R2, + 1/R3......)

Question 26

If the circuit is balanced and the current flow on each line of the circuit is the same, how much current will the neutral conductor carry?

Answer 26

0 Amps

Question 27

(Series or Parallel) Has two or more paths for current to flow through

Answer 27

Parallel

Question 28

In a 2-wire circuit, the _____ flowing on the neutral will be the same as the ______ on the ungrounded conductors.

Answer 28

Current, Current

Question 29

This type of circuit is also called a "closed-loop system"

Answer 29

Series

Question 30

In a series circuit, what does the sum of the voltages equal?

Answer 30

Voltage of the power source

Question 31

In a series circuit, what is the value of the current through all the resistances?

Answer 31

The same

Question 32

In a 2-wire circuit, is it required to pigtail the conductors?

Answer 32

No

Question 33

In a series circuit, what is the total resistance equal to?

Answer 33

The sum of all the resistances in the circuit

Question 34

(Series or Parallel) The sum of the voltage drop of all resistors must equal the voltage of the source

Answer 34

Series

Question 35

(Series or Parallel) Voltage is the same across each component of the circuit

Answer 35

Parallel

Question 36

When power supplies are connected in parallel, what remains the same and what will be increased?

Answer 36

Voltage remains the same and current or amp-hour capacity will be increased

Question 37

(Series or Parallel) The sum of the power consumed by all resistors equals the total power of the circuit

Answer 37

Series

Question 38

Will opening the ungrounded or neutral conductors in a 2-wire circuit during replacement of a device cause a safety hazard?

Answer 38

No

Question 39

What are the three main advantages to a multi-wire branch circuit

Answer 39

Less conductors Smaller Raceway Lower conductor voltage drop

Question 40

What is the formula for the Equal Resistance Method?

Answer 40

Resistance of one element / total number of resistors

Question 41

When will the neutral conductor of a 4-wire, 120/208V or 277/480V circuit carry current?

Answer 41

When the load on the ungrounded conductors is not identical