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Electrical Theory Basics > Ch 3 > Flashcards

Ch 3 Flashcards

1
Q

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

A

The sum of the branches’ powers

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2
Q

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

A

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

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3
Q

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

A

Unbalanced Current

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4
Q

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

A

Always

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5
Q

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

A

Less

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6
Q

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

A

Parallel

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7
Q

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

A

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

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8
Q

This conductor is also called a “grounded conductor”

A

Neutral

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9
Q

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

A

The total power consumed by the circuit

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10
Q

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

A

Parallel

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11
Q

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

A

Neutral

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12
Q

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

A

Parallel

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13
Q

Term for “connected to the Earth”

A

Grounded

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14
Q

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

A

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.

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15
Q

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

A

Multi-wire Circuit

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16
Q

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

A

Series

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17
Q

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

A

The difference between the current on the ungrounded conductors

18
Q

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

A

Additive

19
Q

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

A

Parallel

20
Q

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

A

The same

21
Q

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

A

The total current that flows from the power source

22
Q

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

A

Not terminating the ungrounded conductors to separate phases

23
Q

(Series or Parallel) Current is constant

A

Series

24
Q

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

A

Series

25
Q

What is the formula for the Reciprocal Mehtod?

A

Rt = 1 /(1 /R1, + 1/R2, + 1/R3……)

26
Q

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?

A

0 Amps

27
Q

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

A

Parallel

28
Q

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

A

Current, Current

29
Q

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

A

Series

30
Q

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

A

Voltage of the power source

31
Q

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

A

The same

32
Q

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

A

No

33
Q

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

A

The sum of all the resistances in the circuit

34
Q

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

A

Series

35
Q

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

A

Parallel

36
Q

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

A

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

37
Q

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

A

Series

38
Q

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

A

No

39
Q

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

A

Less conductors
Smaller Raceway
Lower conductor voltage drop

40
Q

What is the formula for the Equal Resistance Method?

A

Resistance of one element / total number of resistors

41
Q

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

A

When the load on the ungrounded conductors is not identical

Electrical Theory Basics (11 decks)

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