Module 4 - EPR (Series and Parallel Circuits)

Question 1

What is Kirchhoff’s 2nd Law

Answer 1

The Sum of the Electromotive Force = The Sum of the Potential Difference in a closed loop

Question 2

What is Kirchhoff’s 1st Law

Answer 2

At any given point in the circuit the Sum of the Current flowing into a junction = the Sum of the Current flowing out of a junction

Question 3

What is the equation for the total resistance of resistors in series

Answer 3

R = R1 + R2 + …

Question 4

What is the equation for the total resistance of resistors in parallel

Answer 4

1/R = 1/R1 + 1/R2 + …

Question 5

Derive the equation for resistance in parallel

Answer 5

It = I1 + I2 (if 1 and 2 are in parallel)
I =V/R
Vt/Rt = V1/R1 + V2/R2
Vt = V1 = V2
Vt(1/Rt) = Vt(1/R1 + 1/R2)
So, 1/Rt = 1/R1 +1/R2 …