Chapter 15: Electricity Flashcards
Electric currents
Electrons put on motion
Two types of electric current and explain
D.C.- electrons move in one direction, can’t travel long distances(1 miles plus), needs a source and expensive pathway for them to travel through
AC- electrons move back and forth and can go long distances
What outlets used in homes
60 hertz means the electrons go back and forth 60 times/seconds
Why do electrons choose to move
Voltage pushes them and the higher the voltage the more electrons want to move and jump
Amperage
The amount or number of electrons moving
Power is measured in
Watts
Kilowatt
1.5 kilowatts
1000 Watts
1,500 watts
Conductor
Is any substance that allows free flow of electrons
Insulator
Substance that doesn’t transmit electricity well
Nichrome
Nickel chromium wire=metal that conducts but not well;enough resistance to heat it’s in toasters
Circuit
Circular pathway
Load
Part of circuit doing work
Why does light come on right away if it takes a day for one electron to jump from atom to atom and make it through the wire/circuit?
Bc electron pushes her neighbors who pushes her neighbor etc so voltage is immediate
The thicker the wire
More amps and electrons can flow so it’s faster
Ground wire
Third prong on cord it prevents damage
Fuse
When a cord melts it melts the fuse instead of the cord and it breaks circuit
Circuit breakers replace ______
What do they do
Fuses
Switches open and close and that turns on or off the System and prevents fire
Short circuit
Current flow is bypassing the load
Edison nicknamed
The napoleam of inventions
The name of edisons co
Competition?
Edison General Electric company
Competition= Westinghouse and tesla electric goes 100s of miles bc only a few
Tesla helped the battle of currents by
Building electric AC motor that was much more efficient than DC
THEREFORE WESTINGHOSUE WAS WINNING
Edison GE became
General Electric and joined forces with Westinghouse to build a power plant
Tesla made it possible
For getting electricity to all USA also elevators electric motors cities blenders washing machine etc
Series circuit
Electricity goes through a series of loads it has less voltage if you add more loads the power lessens and the light gets dimif you breaks pathway by a switch or if a wire breaks the whole system shuts down so if one bulb blows the whole system dos too
Parallel circuit
Have parallel wires and alternate paths in case in burns out the rest of the lights are still ok the voltage is constant
Solenoid
Basis of Bella and starting a car you switch the electricity on and off the ‘‘tis hit the gear and that turns the car on
How do meters work
If you run electricity through the wires it creates an electromagnet. The needle moves based upon electricity put through the wire/coil. Needle moves forward and backwards and create a meter affect
How motors work
Every time cool makes a 1/2 turn direction of current switches
Commutator
Device that switches the direction if current in motors
ELSCTRIC MOTORS CHANGED THE WORLD
type of superconductor
Graphemes and it can tore mor eelectricty and charge fagster
A ____ and a ________ are the same thing run backwards
Motor and generator
Alternate types of electricity
Windmills photovoltaic cells solarc cells
What kind of fields are photovoltaic solar cells put on
Brown field
Photovoltaic solar cells made
From silicon crystals bc when aunlight hits the silicon atom an electron is kicked off
