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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The electrical resistivities of four materials P, Q, R and S are given below:
$\begin{matrix}\text{P}&6.84\times10^{-8}\Omega\text{m}\\\text{Q}&1.70\times10^{-8}\Omega\text{m}\\\text{R}&1.0\times10^{15}\Omega\text{m}\\\text{S}&11.0\times10^{-7}\Omega\text{m}\end{matrix}$
Which material will you use for making:
Two exactly similar electric lamps are arranged (i) in parallel, and (ii) in series. If the parallel and series combination of lamps are connected to 220V supply line one by one, what will be the ratio of electric power consumed by them?
An electric iron is connected to the mains power supply of $220V$. When the electric iron is adjusted at ‘minimum heating’ it consumes a power of $360W$ but at ‘maximum heating’ it takes a power of $840W$. Calculate the current and resistance in each case.