Question

In a domestic electric circuit, with which wire we connect a fuse?
$(A)$ Live wire
$(B)$Neutral wire
$(C)$Earth wire
$(D)$Any of these

Answer 1

Hint : A fuse may be a device that is employed to protect electrical appliances and also circuits from damage. Its work is to detect any type of short circuit and therefore stop the flow of current from that circuit. We all know that a fuse has a thin wire of high resistance and also low melting point and it’s generally constructed of copper, zinc, aluminum, silver, or an alloy to supply the characteristics needed by the fuse.

Formula used:
Poiseuille's law for the volume flow rate is
$Q = \dfrac{{\nabla P\pi {r^4}}}{{8\eta l}}$
Where, $Q$ is the volume flow rate, $\nabla P$ is the pressure difference, $r$ is the width of the tube for flow, $l$ is the length of the tube for flow, and $\eta$ is the coefficient of viscosity.

Complete step-by-step solution:
Option A: In the live wire
A live wire is that the wire through which current passes at first while entering the circuit and therefore the appliance, so the live wire has a potential difference, and also current passes from the live wire so a fuse will be connected with the live wire.
So option A is correct.
Option B: In the neutral wire
Through a neutral wire current flow while exiting the circuit, or the appliance so it doesn’t have a potential difference and if we connect a fuse with neutral wire it’s impossible to save lots of any valuable electric appliance as the current has already passed through half of the circuit and therefore the appliance. So a fuse can’t be connected with a neutral wire.
So, option B is incorrect.
Option C: In the earth wire
An earth wire is usually given to save lots of electrical appliances from short circuit current. It’s done so that if the fuse doesn’t melt with the short circuit current then the excess current may pass through the earth wire and will be neutralized but if a fuse is placed there then it will break the circuit and as a result, the circuit and also the appliance both are damaged.
This option is incorrect.
Option D: Any of these.
This option is incorrect.
So, the correct answer is “Option A”.

Note: We must note that the fuse will only work if it’s placed at the proper place within the circuit. The live wire is the perfect place as it has a very high potential of magnitude $220$ Volt and within the other case, the neutral wire has zero potential so it’s not a feasible area to put a fuse there.