One last question. Please help.

Question

A 40 ohm resistor is connected in parallel with a 100 ohm resistor. What is the equivalent resistance of the circuit?

Question 4 options:

19.7 Ω


140 Ω


28.6 Ω


60 Ω

Answer 1

1/R = 1/R₁ + 1/R₂ = (1/40 + 1/100) Ω^-1

 

1/R = 0.035 Ω^-1

 

R = (1/0.035) Ω ≅ 28.57 Ω

 

28.6 Ω is close enough.