Applications of Heating Effect of Electric Current

What is Joule’s heating effect ? 

Why tungsten is used as the filament of electric bulb ?

The electric bulb filament is made of _____.

 An electric bulb converts electrical energy into 
 

Read the given passage and answer the following question:

The home electrical connection consists of 'live', 'neutral' and 'earth' wires. The 'live' and the 'neutral' wires have potential difference of $220 \mathrm{V}$. The 'earth' is connected to ground. Due to a fault in the equipment or if the plastic coating on the 'live' and the 'neutral' wires give a path for the two wires to come in contact with each other and a large current flows through it producing heat. If any inflammable material (such as wood, cloth, plastic, etc.) exists around that place it can catch fire. Therefore, a fuse wire is used as a precautionary measure.

From the below choose the name of the wire that is used to limit the current in an electric circuit by melting due to overheating when excessive current passes through it.

The _____ effect of electric current is used in the working of an electric fuse.

What is a fuse?

Assertion: Fuse wire of any electronic equipment must have high resistance and low melting point.
Reason: Fuse is used for small current flow only.

A fuse wire of circuit cross-section and having a diameter of $0.4 \mathrm{mm}$, allows $3 \mathrm{A}$ of current to pass through it. But if another fuse wire of same material and circular cross-section and having a diameter of $0.6 \mathrm{mm}$ is taken, then the amount of current passed through the fuse is:

A fuse wire with a radius of $1 \mathrm{mm}$ blows at $1.5 \mathrm{A}$. If the fuse wire of the same material should blow at $3.0 \mathrm{A}$, the radius of the fuse wire must be:

A house, served by a $220 \mathrm{V}$ supply line is protected by a $9 \mathrm{A}$ fuse. The maximum number of $60 \mathrm{W}$ bulbs in parallel that can be turned on is:

All the bulbs in the given figure are identical. Which bulb lights up most brightly?

What is immaterial for an electric fuse?