First slide

Cell

Question

Two identical cells connected in series send 10 amp current through a 5 $Ω$ resistor. When they ale connected in parallel, they send 8 amp current through the same resistance. What is the internal resistance of each cell

Moderate

A

zero
B

2.5 $Ω$
C

10 $Ω$
D

1.0 $Ω$

Solution

For series combination
$2 E = (5 + 2 r) 10 or E = (5 + \frac{r}{2}) 8$
Solving, we get r = 2.5 $Ω$

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