In a battery of 30 cells connected in series, three cells are connected wrongly with reverse polarity. How many cells in the battery are effective?

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Solution

Step1:- Given data
Number of cells $N = 30$
The number of cells with the wrong polarity is $n = 3$
Step2:- Finding the number of effective cells.
The number of ineffective cells is, $2 n = 2 \times 3 = 6$
Now, $T h e n u m b e r o f e f f e c t i v e c e l l s = T o t a l N u m b e r o f c e l l s - N u m b e r o f i n e f f e c t i v e c e l l s .$
Number of effective cells $= 30 - 6$
$= 24$
Hence, $24$ cells are effective.

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