The total resistance in an electrical circuit consisting of three heater elements is 12.61 ohms. The resistances of two of the heater elements are 3.9 ohms...

Question

...and 5.04 ohms. Find the resistance of the third heater element

Answer 1

If the 3 elements are in series, the 3 individual resistances must add up to the total resistance.

 

3.9 + 5.04 + R₃ = 12.61

 

 

R₃ = 12.61 - (3.9 + 5.04)

 

Can you finish from here and get a final answer in ohms?