Question 699: Current Electricity

Question

24 cells of emf $$1.5 \mathrm{~V}$$ each having internal resistance of $$1 \mathrm{~ohm}$$ are connected to an external resistance of $$1.5 \mathrm{~ohms}$$. To get maximum current

Accepted Answer

For series, $$i=\frac{n E}{n r+R}$$
$$i=\frac{24 	imes 1.5}{24+1.5}=1.41$$
For parallel, $$i=\frac{E}{\frac{r}{n}+R}$$
$$i=\frac{1.5}{\frac{1}{24}+1.5}=0.97$$
For $$4 	imes 6$$ combination
$$\begin{aligned}
& i=\frac{n E}{R+\frac{n r}{m}} \
& i=\frac{4 	imes 1.5}{1.5+\frac{4}{6}}=2.77
\end{aligned}$$
For $$6 	imes 4$$ combination
$$\begin{aligned}
i & =\frac{n E}{R+\frac{n r}{M}} \
\Rightarrow \quad i & =\frac{6 	imes 1.5 	imes 4}{12}=3
\end{aligned}$$

Answer

all cells are connected in series combination

Answer

all cells are connected in parallel combination

Answer

4 cells in each row are connected in series and 6 such rows are connected in parallel

Answer

6 cells in each row are connected in series and 4 such rows are connected in parallel

Current Electricity

24 cells of emf $1.5 \mathrm{~V} each having internal resistance of 1 \mathrm{~ohm} are connected to an external resistance of 1.5 \mathrm{~ohms}$. To get maximum current

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