Which instrument is used to measure electric current?

Give a single word for $\frac{1 \text{ joule}}{1 \text{ coulomb}}$.

The filament of an electric bulb is made of tungsten. Why?

The equivalent resistance between points $A$ and $B$ of the following electric circuit will be $.........$

Resistivity of two elements $A$ and $B$ are $1.62 \times 10^{-8} \, \Omega m$ and $520 \times 10^{-8} \, \Omega m$ respectively. Out of these two,name the element that can be used to make
$(i)$ filament of electric bulb.
$(ii)$ wires for electrical transmission lines. Justify your answer in each case.

In an electrical circuit,three incandescent bulbs $A, B$ and $C$ of rating $40 \, W, 60 \, W$ and $100 \, W$ respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?