electricity Flashcards
current is
a measure of the flow of elevtrons around the circuit (Amps A)
Potential Difference
force driving flow of electrons
- provided by cell/battery
- voltage (V)
resistance
Everything that resists or opposes the flow of electrons
- OHMS
how does current always flow (in convenction current)
from the positive to the negative
what equation connects potential diff, resistance and current
V = IR
as long as the resistance stays constant
as the voltage increses the current will increases proportianally
if we increases the tempreture
the resistance would also increases temperature
increases, all of the ions in the metal vibrate faster, which makes it harder for electrons to pass along the wire (or in other words, the resistance increases).
what does diode do
it only allows the current flow one way in the circuit by making the resistance towatds the opposite direction too high
what charge is
a measure of teh total current that flowed within a centain period of time
what equation connects charge current and time
Q = I x T
what si a fuse
breaks if too much current ges throught it
differencce between series and parallel circuit
series circuit only has one loop and all the components are connected toeach other.
On the other hand parallel circuit contains more tahn one loops.
potential difeference in a series circuit
is shared across all of the components
V total (in series)
V1 + V2 +…. e.g if total V = 12
and componets 1 V = 6 then comp 2 V = 4
current is series circuit
same everywhere in the circuit
- ammemter place in series, anywhere
- volmeter connect in parallel to your component
current calculation
I = V (total potential diff) / R (total resistance)
total resistance in seires curcuit
= sum of individual reisistance of each components
how to calc the voltage acroos a single componet
current X resistance across that specific component
ohms law
componets with a greater reisistance will always have a higher share of the voltage
one rreason parallel is better than series
if one componet in the parallel breaks then the overall circuit still works
V total in parallel
V1=V2=V3 …