$(a)$ What material is used in making the filament of an electric bulb ?
$(b)$ Name the characteristics which make it suitable for this.
What is the resistance of an ideal ammeter ?
Write the mathematical expression for electric potential.
If $R_{1}$ and $R_{2}$ are the resistances of filaments of a $400\, W$ and a $200\, W$ lamp, designed to operate on the same voltage, then
The amount of $2\, A$ electric current is passed for $1\, minute$ through a conducting wire. How much total electric charge will pass through this wire?