Question

What is the equivalent resistance between points A and B?

Would this be the correct approach?

• Combine R3 and R4 into one resistor.
• Find the equivalent resistance of R5, (R3+R4), and R2 using the parallel formula.
• Finally, add 50 ohms to the resistance found above as they are in series with each other.

Using this approach, I get an answer of 75 Ohms. Is this correct?

Answer 1

I also get an answer of 75 Ohms. Your approach is correct.

Explanation:

I worked it slightly differently. I saw that R3 and R4 added to 100 Ohms and saw that it was in parallel with another 100 Ohms, R2. So R2, R3, & R4 reduce to 50 Ohms. It is in parallel with another 50 Ohm resistor, so those 4 are equivalent to 25 Ohms. And from there to 75.

I hope this helps,
Steve