Question 126: Current Electricity

Question

There are ' $n$ ' number of identical electric bulbs, each is designed to draw a power $p$ independently from the mains supply. They are now joined in series across the mains supply. The total power drawn by the combination is :

Accepted Answer

$$\begin{aligned}
& \mathrm{R}_{\mathrm{s}}=\mathrm{R}_1+\mathrm{R}_2+\mathrm{R}_3+\ldots \ldots \ldots+\mathrm{R}_{\mathrm{n}} \
& \frac{\mathrm{~V}^2}{\mathrm{P}_{\mathrm{s}}}=\frac{\mathrm{V}^2}{\mathrm{P}}+\frac{\mathrm{V}^2}{\mathrm{P}}+\ldots \ldots . .+\frac{\mathrm{V}^2}{\mathrm{P}_{\mathrm{n}}} \
& \mathrm{P}_{\mathrm{s}}=\frac{\mathrm{P}}{\mathrm{n}}
\end{aligned}$$

Answer

np

Answer

p

Answer

$\frac{\mathrm{p}}{\mathrm{n}^2}$

Answer

$\frac{p}{n}$

Current Electricity

There are ' n ' number of identical electric bulbs, each is designed to draw a power p independently from the mains supply. They are now joined in series across the mains supply. The total power drawn by the combination is :

Choose the correct answer: