Upgrade to remove ads
Only $2.99/month

Parallel circuits

Terms in this set (27)

in parallel circuits each component is separately connected to the
positive and negative of the power supply
parallel=
separate
series+
in a line
in parallel circuits each component is separately connected to the positive and negative of the power supply except
ammeters which are always connected in series
Unlike in series, if you remove or disconnect a component, it will hardly have an
effect on the other components
parallel circuits are how cars and
household electronics must be connected
in parallel circuits you must be able to switch everything on and off
separately
in parallel, the potential difference is the
same across all the components
pd is the same across all the components, this means that, identical bulbs connected In parallel will all be at the same
brightness
in parallel what is shared between branches
current
I total =
I1+12+...
in parallel circuits the total current flowing around the circuit is equal to the
total of all the currents through the separate components
What do parallel circuit have where does the current either splits or rejoins
junctions
parallel circuits have junctions where the current
splits or rejoins
The total current going into a junction has to equal the total
current leaving
if two identical components are connected in parallel then the
same current will flow through each component
what will reduce the total resistance in a parallel circuit?
adding a resistor
If you have two resistor in parallel, their total resistance is less than having the resistance of the
smallest of the two resistors
-In parallel both resistors have the same pd across them as a source
- This means the 'pushing force' making the current flow is the same as the source pd for each resistor you add
- But by adding another loop,
Using V=IR, an increase in current means an increase in the total resistance of the circuit
pd across them as a source
Using ....., an increase in current means an increase in the total resistance of the circuit
V=IR
Using V=IR, an increase in current means an
increase in the total resistance of the circuit
-In parallel both resistors have the same
pd across them as a source
-In parallel both resistors have the same pd across them as a source
- This means the 'pushing force' making the current flow is the same as the
source pd for each resistor you add
-In parallel both resistors have the same pd across them as a source
- This means the 'pushing force' making the current flow is the same as the source pd for each resistor you add
- But by adding another loop, the current has more than
one direction to go in
by adding another loop and the current having more than one direction to go in, this means the
total current that can flow around the circuit increases
parallel circuit- indépendant and isolated
what happens to the current and resistance in a circuit containing a cell and a resistor when a second resistor is added in parallel:
The current through the circuit increases and the total resistance of the circuit decreases to less than the resistance of the smallest resistor
THIS SET IS OFTEN IN FOLDERS WITH...