Question:
Two identical cells connected in series send $10\,A$ current through a $5\Omega$ resistor. When they are connected in parallel, they send $8\,A$ current through the same resistance, the internal resistance of each cell is
Two identical cells connected in series send $10\,A$ current through a $5\Omega$ resistor. When they are connected in parallel, they send $8\,A$ current through the same resistance, the internal resistance of each cell is
Updated On: Jul 7, 2022
- Zero
- 2.5$\Omega$
- 10 $\Omega$
- 15 $\Omega$
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The Correct Option is B
Solution and Explanation
For series combination $2 \xi = (5 + 2r) 10$ . For parallel combination $\xi = ( 5 + \frac{r}{2} )8$
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Concepts Used:
Cells
- A device that converts chemical energy into electrical energy is called an electric cell. To an electric circuit, the battery provides the constant electromotive force.
- Each cell comprises 2 half cells which are connected in series by a conductive electrolyte containing anions and cations:
- One-half cell is made up of electrolyte and a negative electrode called an anion.
- The other half cell is made up of electrolytes and a positive electrode called a cathode.
- Redox reactions take place simultaneously.
- While charging, cations are reduced at the cathode, and anions are oxidized at the anode.
- Electrodes do not join each other as they are electrically connected by the electrolyte.