Analyze the circuit in Figure 1 with given resistors R1=2Ω, R2=4Ω, R3=5Ω, R4=4Ω and source voltage V=12V. Calculate total resistance with R3 removed.

Here are the solutions to your questions:

1) Consider the circuit of Figure 1

• Given resistors: $R_1 = 2 \, \Omega$, $R_2 = 4 \, \Omega$, $R_3 = 5 \, \Omega$, $R_4 = 4 \, \Omega$.
• Source voltage: $V = 12 \, V$.

a) Determine the total resistance when R3 is removed (open circuited)
When $R_3$ is removed, $R_1$ and $R_2$ are in parallel, and this combination is in series with $R_4$.

Step 1: Calculate the equivalent resistance of $R_1$ and $R_2$