electricty Flashcards
What is an electric current
its a flow of charge in a conductor
what is the flow of charge in a metal
flow of electrons
which way does a conventional current flow
positive to negative
another name for positive terminal
surplus
another name for negative terminal
deficancy
what is a current
amount of charge passing a point in a second
what is the current symbol
I
what is current measured in
amps
what do you use to measure current
ammeter
must the annemter be connected in series or parallel
series
how many milliamperes in an ampere
1000
what is a cell
source of energy in a circuit
what is the amount of energy per unit charge measured in
volts
what happens to chemical energy in a battery
its converted to electrical energy
what are wet cells
source of power that produces energy through a chemical reaction ina solution
what are dry cells
source of power that has reactive chemical in a dry paste.
true or false: the positive end of a cell is connected to the negative end in series
true
what is the advantage of cells in series
you have a higher voltage
how are cells joined in a parallel circuit
end of positive cells are joined together and end of negative cells are joined together.
what is the advantage of having cells connected in parallel
lasts longer
true of false: the total potential diffrence of cells in parallel is not equal to one of the branches
false, it is
what is another term for potenial diffrence
voltage
what is potential difrence
amount of energy gained or lost by a unit of charge
symbol for voltage
v
what is voltage measured in
volts
what do we measure voltage with
voltmeter
what does a lightbulb convert energy into
light and heat
what are conductors
substance that allow the flow of charge through them
do conductors offer some resistance
yes
what is resistance measured in?
ohms
why is resistance present in a conductor
due to collisions between moving charges and particles
what are some factors that affect resistance
length, thickness, type(material), temp
