Question

Three resistors 2 ohm , 4 ohm and 5 ohm are combined in parallel. What is the total resistance of the combination.

please please solve it step by step.
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Answer 1

Explanation:

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Answer 2

Answer:

if R1 , R2 and R3 are connected in parallel, then the total resistance R of the combination is,

1/R = 1/R1 + 1/R2 + 1/R3

=> 1/R = 1/2 + 1/4 + 1/5

=> 1/R = (10 + 5 + 4) / 20

=> 1/R = 19/20

by taking reciprocal, we get,

R = 20/19 => 1.053 ohms ~ 1.05 ohms