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q asked in Science & MathematicsPhysics · 6 years ago

What is the equivalent resistance of a group of resistors?

The resistors are 2 ohm, 1 ohm, and 2 ohm. I know the formula is

Req= 1/R1+1/R2+1/R3

So Req=1/2+1/1+1/2=2

But 2 is not the correct answer? Am I doing something wrong? Please help, thanks!

1 Answer

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  • derfram
    Lv 7
    6 years ago

    You've got the formula slightly wrong.

    1/Req = 1/R1 + 1/R2 + 1/R3...

    You determined that 1/Req = 2 so

    Req = 0.5 ohms

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