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Course: Class 12 Physics (India) > Unit 3

Lesson 6: Combination of cells

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Cells in series and parallel

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Two cells of emf,

E_{1}

and

E_{2}

, and internal resistances,

r_{1}

and

r_{2}

, respectively, are connected in series across a resistor.

The current in the circuit is

I = 1.2 A

.

Components	Values
$E_{1}$ ‍	$4.0 V$ ‍
$r_{1}$ ‍	$1.5 Ω$ ‍
$E_{2}$ ‍	$8.0 V$ ‍
$r_{2}$ ‍	$0.50 Ω$ ‍

What is the external resistance, $R$ ‍?

R =

Ω