Define Filament.

Write the conventional symbol of the following component used in electric circuit diagram-

Electric bulb

Correct the statements by modifying the underlined words appropriately if it is wrong.

Heating coils are made up of materials having high resistivity and low melting point.

When $2 \mathrm{A}$ current is passing through a conductor in $10$ seconds, $80 \mathrm{J}$ heat is produced then find the resistance of conductor.

DOWN:

$1$. An inert gas filled in the bulbs.

$2$. A metal which is a good conductor of electricity

$3.$ This part acts as the positive terminal of a dry cell

$5.$ The source of energy in a torch

ACROSS:

$3.$ A light-giving device made of wax.

$4.$ A light-emitting part of a torch

$6.$ A metal used to make filament of an electric bulb

$7.$ An insulator also used as a fuel and for making furniture.

Draw a labelled diagram of an electric bulb. Name the gases filled in the bulb.

Name two electric devices which are used for $\left(b\right)$ lighting

The statements given below are incorrect. Write the correct statements.

$4.$ The supporting wire breaks in a fused bulb.