Electrons, waves, and photons: Electrical circuits Flashcards
How does p.d split in a circuit when components are connected in series with different resistances
The component with the highest resistance will take the larger share of the p.d in proportion with the ratio of resistances
in a parallel circuit of emf x how much p.d flows down each branch
x V
State Kirchhoff’s second law
In a closed loop, the sum of emfs is equal to the sum of p.ds
How does current split in a parallel circuit
In parallel circuits, the current depends on the resistance of the path, the greater the resistance the less current that flows along in in proportion to the ration of resistances along each branch
What happens to current when a new branch is added in a parallel circuit
Total current drawn from the power source is increases whrn new branches are added and the current draw for the other loops remains the same
what happens to p.d when a new branch is added to a parallel circuit
The p.d for the new lop is the same as the emf
What happens to resistance when 2 identical resistors are connected in parallel
the resistance decreases, where the combined resistance is less than a single resistor
1/R = 1/R1 +1/R2+ …
what is internal resistance
Internal resistance is the energy lost to heat insaid ea powersource before being used in a circuit
When I = 0, what does V(termainal) equal
emf of the power source
When plotting a graph of V against I when investigating internal resistance, what does the gradient equal
-r
When plotting a graph of V against I when investigating internal resistance, what does the y-intercept equal
emf
What are the 2 potential divider equations
V(1)/V(2)= R(1)/R(2)
V(out)= (R(2)/R(1)+R(2))x (in)
how does p.d split in a potential divider
in the ratio of their resistances
When 2 resistors are connected in series, how does their resistances combine
R(total)=R(1)+R(2)
