Give three reasons why different electrical appliances in a domestic circuit are connected in parallel.
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Different electrical appliances in a domestic circuit are connected in parallel because of the following advantages:
If one electrical appliance stops working due to some defect, then all other appliances keep working properly.
Each electrical appliance has its own switch due to which it can be turned on or turned off independently, without affecting other appliances.
Each electrical appliance gets the same voltage as that of the power supply line.
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A resistor of 8 ohms is connected in parallel with another resistor X. The resultant resistance of the combination is 4.8 ohms. What is the value of the resistor X?
The electrical resistivities of five substances A, B, C, D and E are given below:
$\begin{matrix}\text{B}&110\times10^{-8}\Omega\text{ m}\\\text{C}&2.60\times10^{-8}\Omega\text{ m}\\\text{D}&10.0\times10^{-8}\Omega\text{ m}\\\text{E}&1.70\times10^{-8}\Omega\text{ m}\end{matrix}$
What will be the resistance of a metal wire of length $2$ metres and area of cross-section $1.55 \times 10m $, if the resistivity of the metal be $2.8 \times 10 m?$