Question 283: Current Electricity

Question

The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2$\Omega$. The value of internal resistance of each cell is

Accepted Answer

From diagram
${i_p} = {E \over {2 + {r \over 2}}}$ and ${i_s} = {{2E} \over {2 + 2r}}$
given ${i_p} = {i_s}$
${1 \over {2 + {r \over 2}}} = {1 \over {1 + r}}$
$1 + r = 2 + {r \over 2}$
$r = 2\,\Omega $

Answer

2$\Omega$

Answer

4$\Omega$

Answer

6$\Omega$

Answer

8$\Omega$

Current Electricity

The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2\Omega. The value of internal resistance of each cell is

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