Question

Question #1d0dd

Answer 1

All domestic equipment come with a standard voltage.,.In parallel circuit each equipment gets the same voltage.

Explanation:

So you have to connect them in parallel to work. IN series if one bulb gets fused the whole chain do not work.
All bulbs, fans,,other small equipment are connected in parallel.

Answer 2

One of the most important merit is that a parallel circuit has `color(red)"constant"` voltage.

Explanation:

This question should be categorized as physics rather than as earth science.

The most important merits of a parallel circuit are summerized in two ways.

(1) The voltage is constant for all resistors.
(2) Even if some parts of the circuit are unconnected, current keeps flowing through the other parts of the circuit.

Merit (2) has been already explained and visualized in chandramohanPanakkal's post. This article focuces on merit (1).

For example, supposing two electrical appliances `X,Y` with electricity `P=200 W` when used at the voltage `V=100V`.

The current is calculated by `I(A)=(P(W))/(V(V))` and both `X,Y` can flow `(200(W))/(100(V))=2.00(A)` current when they are used at `100V`.
Their resistance is `R(Ω)=(100(V))/(2.00(A))=50.0(Ω)` .

Let's see what happens if `X` and `Y` were used in a `color(blue)"series circuit"` with `V=100(V)`.
The total resistance would be `R=50+50=100(Ω)` and the current would be `I=(100(V))/(100(Ω))=1.00 (A)`
Therefore, the voltage on `A` would be `V_A=1.00(A)*50.0(Ω)=50.0(V)` and this is the same as the voltage on `B`.
Electrical appliances wouldn't work at the half voltage as had been expected!

On the other hand, if `X` and `Y` are used in a `color(red)"parallel"` circuit at `100V`, the voltage on `X` and `Y` is always `100V` and they work safely.