ALL Flashcards
example of history of electricity
ben franklin shows lightning is electricity
Force created by a difference in charges due to gained or lost electrons
electricity
what can move from one Atom to another; what cannot
electrons; protons
what charge are electrons
negative
what must you have for electricity to flow
Circuit, current, voltage
electrons moving from point a to point B
current
what is current measured in
amperes (amps)
A closed continuous path
A circuit
where does electricity always flow
A location with a positive charge
difference in charge from one end of the wires to the other that pushes the electrons
voltage
electrons can be rubbed off of one object on to another
static charge
what happens when a neutral objects are rub together and charges are rearranged
they stick together
A temporary one time charge produced by an excess of electrons
static electricity
can be used to tell detect a static charge
electroscope
what three ways is a static electricity caused
friction, conduction, induction
when objects rub together and electrons are transferred
friction
charged objects touch another object in electrons are transferred
conduction
A charged object is held close to another object and that causes charges to be rearranged
induction
example of friction
during a storm, water and dust particles are rub together by winds
example of conduction
during a storm charged areas touch other areas of the clouds and some charges are transferred
example of induction
during a storm when a highly charged cloud is overland, a charged area on the ground is produced
how is lightning created
friction, and conduction, induction
uses of static electricity
Air pollution control, air fresheners,xelography, painting cars
provide a conducting path to the earth which is independent of the normal current carrying path in an electrical appliance
ground
Materials through which electrons can easily move
conductors
what are examples of good conductors of electricity
Metal, acids, sea water, tapwater
Materials through which electrons cannot move easily
insulator
examples of good insulators
Wood, ceramic, Rubber, glass, plastic
Materials that can slow the flow of electricity without stopping it off together
resistors
what is resistance measured in
Ohms
The push behind electric current to the number of electrons flowing and to the resistance to the flow
ohm’s law
equation of ohms law
I = V/R
what is voltage measured in
volts
turns chemical energy into electrical energy and cause the voltage that makes electrons flow
electrochemical cells
three main parts of electrochemical cells
Anode Cathode Electrolvte
two kinds of electrochemical cells
wet cells and dry cells
what is a wet cell and what is an example
liquid electrolyte; Car battery
what is a dry cell; what is an example
A gel electrolyte; flashlight battery
when electrons flow in only One Direction
Direct current
electrons first go in One Direction, then reverse, then back again
alternating current
A circuit in which the current must pass through all of the resistors on only one path
Series circuit
A circuit in which the current can travel through more than one path
parallel circuit
formula for electric power
P = V • I
what is the formula for energy
E= P•T
Device that moves a magnet near a wire to create a steady flow of electrons
generator
regions of the magnet that produce magnetic force
magnetic poles
how can space around a magnet through which magnetic force is exerted can be seen
with iron filings
where are the magnetic field the strongest
at the poles
why are most materials not magnetic
electron pairs cancel out Their magnetic field
what elements have magnetic properties
Iron, nickel, cobalt
when iron is placed in a strong magnetic field and when the magnetic field leaves The iron is still magnetic
permanent Iron magnet
when placing materials with iron in them near a strong magnetic field, once fields are gone domains will revert to original state
temporary magnets
how can you destroy a permanent magnet
by heating them up or dropping them
what does reversing current flow of the magnetic field do
it reverses the direction
current carrying coil of wire with many loops
electromagnets
what three factors are electromagnets strength affected by
of loops in the coil
amount of current
presence of iron core
what happens to charge particles when they are moving
they are deflected by magnetic fields
is earth a magnet
yes
is earths magnet stable
no
what is the most used appliance at home
Air conditioners/heaters
four major sectors that consume energy
industrial sector, transportation sector, residential sector, commercial sector
what is an industrial sector
includes faculties and equipment used for manufacturing, agriculture, mining, and construction
what is a transportation sector
includes vehicles that transport people or goods
what is a residential sector
consists of homes and apartments
what is a commercial sector
includes offices, malls, stores, hospitals, hotels, where houses, restaurants,other places
