Chapter 10 - Electrical Circuits Flashcards
What is Kirchhoff’s 1st Law?
What is Kirchhoff’s 2nd Law?
Sum of the current in = Sum of the current out
Sum of the EMF = Sum of PD around a loop
What happens if 2 sources of EMF are in polarity of each other?
What happens if 2 sources of EMF are in opposite polarity of each other?
If they are in the same polarity you can add their EMF which is supplied to the entire circuit
If they are in opposite polarity you subtract their EMF which is supplied to the entire circuit
How is PD shared in a series?
How is current split in a series?
How much resistance does the current experience in a series?
What is the formula for Total Resistance in a series?
PD is shared between components according to the ratio of their resistance
Current doesn’t split on flows on one path
Current experiences max resistance as all the resistance lie on the same path
Rt = R1 + R2 + R3
How is PD shared in parallel?
How is current split in parallel?
Formula for Total Resistance in parallel, and what is the relation between the total resistance and the lowest resistor in parallel?
Each branch in a parallel has the maximum PD as its the energy each charge carrier has, following Kirchhoff’s 2nd Law. The PD will split depending on the resistance of components in parallel
Current splits depending on the ratio of the total resistance on each path. therefore they can experience the least amount of resistance overall
1/Rt = 1/R1 + 1/R2 + 1/R3, the total resistance is lower than the lower resistor in parallel
What happens to total resistance in series if you increase the amount of resistors?
What happens to the total resistance in parallel if you increase the amount of resistors?
Due to Rt = R1 + R2 + R3 the total resistance will increase
If theres more resistors, the cross section area increases decreasing the total resistance increasing current through that resistor path due to I = V/R and R = pL/A
