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Electrical Grid 2 > Chapter 1 > Flashcards

Chapter 1 Flashcards

Series and Parallel Circuits

1
Q

What’re the 3 key elements in order for Basic Electrical Circuits to function properly?

A
  1. ) Source of electrical pressure (Voltage)
  2. ) Conductor
  3. ) Load
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2
Q

How is Voltage a key element?

A

It is the force that will push the electrons through the conductor.

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3
Q

How is a Conductor a key element?

A

Conductors are necessary to transmit energy to the point where it will be used.

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4
Q

How is Load a key element?

A

Load is a device that uses the electrical energy from a source to accomplish some useful purpose.

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5
Q

What is an Open Circuit?

A

An incomplete path where electrons are unable to flow through a conductor and provide power.

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6
Q

What will the load limit?

A

The amount of current that can flow through a conductor by providing resistance.

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7
Q

What is a Short Circuit?

A

A circuit that does not have a load, or in which the load has been bypassed.

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8
Q

How can circuits be protected from short circuits?

A

With fuses.

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9
Q

What is a fuse?

A

An intentionally weakened point in a circuit that burns open when current flow is excessive.

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10
Q

What does a Short Circuit have?

A

Very low resistance.

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11
Q

What happens as electrons flow through a conductor?

A

They collide with another and create heat. When current flows, billions of there collisions take place every second.

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12
Q

What happens if too much current flows?

A

The capacity of the conductor will be exceeded and the conductor will melt.

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13
Q

How is a fuse designed?

A

As an intentionally weakened point in a circuit to melt at lower amperage than the conductor, thereby protecting it.

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14
Q

What are the two basic types of circuits?

A
  • Series
  • Parallel
  • Combo
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15
Q

The series circuit is probably the _____ type of circuit.

A

Simplest

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16
Q

How does current flow in a Series Circuit?

A

Only one path for current to flow.

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17
Q

Because there is only one path for current flow, how is the current at any point in the circuit?

A

The same at any point

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18
Q

How are Series Circuits most commonly seen?

A

In lighting applications.

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19
Q

In the power delivery industry what are Series Circuits considered?

A

Impractical

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20
Q

In comparison what do Parallel Circuits have compared to Series Circuits?

A

Practical Value.

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21
Q

What do Parallel Circuits have?

A

Multiple for current to flow.

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22
Q

What are Combination Circuits?

A

Consist of both series and parallel parts.

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23
Q

What Circuit type are power lines?

A

Combination Circuit

24
Q

What is said to be in series?

A

Anything that is connected directly across two points of different potential.

25
Q

What principal is important for a lineworker to understand?

A

Anything that is connected in series will have current flow through it unless resistance is sufficient to prevent it.

26
Q

What happens if a lineworker is between two points of different potential?

A

Current will flow through the body causing injury or death.

27
Q

Even when wearing Protective equipment to do hot work, the worker should never place himself in _____?

A

Series

28
Q

If viewed individually, how is nearly all line equipment connected?

A

In Series

29
Q

What kind of devices may be connected in series?

A
  • Regulators
  • Reclosers
  • Sectionalizers
  • Switches
30
Q

What does it mean when these devices are connected in series with the line?

A

That all of the line current will pass through them.

31
Q

What does any device connected down line from these devices cause?

A

Increase in current flow through them.

32
Q

If a certain amount of current is required for the circuit to operate properly what must voltage be?

A

High enough to maintain the proper current flow.

33
Q

How does Voltage work in a Series Circuit?

A

It requires a certain amount of voltage to push a given current through a given amount of resistance.

34
Q

What is this value known as?

A

Voltage Drop

35
Q

What happens to to voltage as it is ran through a resistance?

A

It drops and less voltage will be available to push current through the next load.

36
Q

By the time current flows through the last load connected to the circuit, what happens to voltage?

A

It is all used up.

37
Q

What must the voltage applied to a circuit equal?

A

The sum of all the voltage drops across all the resistors.

38
Q

Why are power lines considered Combination Type Circuits?

A

Because the equipment that is connected in series with the line; However the layout of the circuit is predominantly parallel.

39
Q

How many paths do Parallel Circuits have?

A

More than one.

40
Q

How are sections divided in the overall power system?

A

At the point where voltage is transformed.

41
Q

How are parallel circuits distinguished?

A

By the fact that the electrical values seen by the source are dependent upon the individual loads.

42
Q

By adding more load what happens to current flow?

A

It will increase and the source will supply more power.

43
Q

We can continue to add load to the transmission line until?

A

The capacity of the wire is reached, or until the source reaches its maximum output.

44
Q

What principle holds true for the electrical system?

A

At each point voltage changes, a new parallel circuit can be viewed.

45
Q

What can we find if you follow the electrical system to the point of utilization?

A

The entire layout is a parallel.

46
Q

What is an advantage to having a parallel type circuit?

A

This design has the distinct advantage of providing reliability.

47
Q

Each load connected in a parallel circuit will have a voltage drop equal to?

A

The applied voltage.

48
Q

Each device connected to a parallel circuit draws what?

A

A certain amount of current.

49
Q

What happens to current flow as deices are added on a line?

A

It will increase.

50
Q

What is the total current supplied by the source?

A

The addition of the current demands of the individuals.

51
Q

What does a load produce?

A

Resistance

52
Q

What does a source produce?

A

Electrical pressure or voltage

53
Q

Three parts of a fuse

A
  1. Stranded Cable
  2. Steel Support Wire
  3. Fusible Element
54
Q

How does current behave in a parallel circuit?

A

Voltage can be different at any given point in the circuit

55
Q

Formula for Current

A

E=I x R

56
Q

What happens when devices are added to the line in a parallel circuit

A

Current flow through the conductors will increase

57
Q

Total current supplied by the source in a parallel circuit

A

The addition of the current demanded of the individual loads

Electrical Grid 2 (3 decks)

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