topic 7 electricity and circuits Flashcards
what is current ?
A measure of the flow of electrons around the circuit
Measure in Amps
what is potential diffrence ?
the force that drives the flow of electrons e.g. battery / voltage
what is resistance ?
everything that opposes the flow of electrons
in series circuits voltage total =
V1 + V2 + V3
in series circuits all voltage must add to how much ?
the amount that the battery provides like 12 volts if 1 battery cell
is the current the same or diffrent everywhere in a series circuit?
the same
what do we measure current with ?
Ameter - we can put the ameter anywhere in a series circuit
ohms law =
V = IR
total resistance =
R1 + R2 + R3
V = IR graphs
If we keep Resistant the same in the equation V= IR then in turn, as we increase the voltage, the current should increase proportionally
○ Resistors can make these lines less or more steep due to the resistance in the current e.g. 2 ohmn resistor would have a very steep line , however, a 10ohmn resistor would have a shallow line
what is charge ?
a measure of the total current that has flowed within a certain period of time
Q = IT =
Charge = current x time
why are parallel circuit the most used circuit ?
○ Parralel circuits are used the most out of any circuit and this is because if any one thing in the cicuit breaks then it means the rest of the components in the circuit can still function
in parallel circuits voltage =
All components will have the same voltage - so if we have a 12 V cell then all components will have 12 V
how is Amps split through a parallel circuit ?
all current is split equally through resistors so if we have a current of 10 amps and 2 resistors each resistor has 5 amps of current
how can we lessen resistance in parallel circuits ?
we add more resistors in parallel