E Grid 2 Flashcards
What are the key elements for an electric circuit to function?
Source
Conductor
Load
What does an open circuit refer to as
Electrons are unable to flow through a conductor to provide power
What is a load?
A device that uses the electrical energy from a source to accomplish some useful purpose
What is a short circuit?
A circuit that does not have a load or in which the load has been bypassed
What is a fuse and what does it do?
A fuse is an intentionally weakened point in a circuit that burns open when current flow is excessive
How are fuses connected?
In series with a load so the circuit will open if the current ratting is exceeded
What are the three parts that make up a fuse?
Stranded cable
Steel support wire
Fusible element
What does a short circuit have
A very low resistance
What is a fused designed to do?
Melt at lower amperage
How many types of circuits are ther and what are they?
Series
Parallel
All circuits are what?
Series
Parallel or a combination of the two
What is a series circuit?
Only one path of current flow.
Where are series circuits most commonly seen?
Lighting applications
What are series circuits considered?
Impractical
What type of circuits are all power lines?
Combination circuit type
What is a parallel circuit?
Circuit that has multiple current paths to flow through
What does the term in series mean?
Anything connected directly across two points of different potential is said to be in series
Anything connected in series has what?
Current flow through it unless the resistance is sufficient to prevent it
A worker should never do what when doing hot work?
Place himself in series
What type of equipment is connected in series with the line?
Regulators
Reclosers
Sectionalizers
And switches
What happens to the current flow when a device is connected further down the line
The current will pass through the device witch cause an increase of current flow through them
If a certain amount of current flow is required for the circuit what must the voltage be?
The voltage must be high enough to maintain the proper current flow
In a series circuit is the current high lower or is it the same through the whole circuit
The current is the same at any given point
What must a transformer do to to maintain the amperage
Supply enough voltage
What is voltage drop?
A certain amount of voltage to push current through a load with a given amount of resistance
In a series circuit what will happen to the voltage as it comes across resistance.
The voltage will drop
What must the voltage drops across all resistors equal ?
The voltage applied to the circuit
Each section in the over all power system is considered having what?
Source
Conductors
And loads
What type of circuit is power lines considered having? And why? But what is the layout of the system predominantly considered as?
Combination type circuit because of the equipment that is connected in series with the line
Parallel
Parallel circuits are considered to have their own source conductors and loads at what point are these sections divided it?
Where the voltage is transformed from one level to another
When leaving the substation on a transmission line what type of circuit is used? And why
Parallel circuit and because each line has its own path to and from the substation of one transmission line goes down the protective equipment will disconnect it from the circuit.
Sub transmission substations are what to the transmission line
Parallel
At each point that the voltage changes a new blank can be viewed
Parallel circuit
How can you find out that the entire layout is a parallel circuit
Point of utilization
Circuits are also considered what type of circuit
Parallel circuit
Each load Connected in a parallel circuit will have what to the applied voltage?
Voltage drop
Each blank connect to a parallel circuit draws a certain amount of current
Device
In a parallel circuit as a device is added to the line current flow through the conductors will decrease true or false
False the current will increase
In order to properly size a line switch fuse what must you do?
Determine the current drawn by each load connected to he circuit
The currents are added to find the overall current drawn by the circuit
The sum is then rounded to the next available fuse size
