What will happen to the current in a circuit,if its resistance is doubled?

Why is very less heat generated in long electric cables than in filaments of electric bulbs?

$A$ piece of wire having resistance $R$ is cut into four equal parts. $(a)$ How will the resistance of each part compare with the original resistance? $(b)$ If the four parts are placed in parallel,how will the joint resistance compare with the resistance of the original wire?

$V-I$ graphs for two wires $A$ and $B$ are shown in the figure. If both the wires are made of the same material and are of equal thickness,which of the two is of more length? Give justification for your answer.

An electron in a metal is free to move anywhere but cannot leave the metal.

How is an ammeter connected in a circuit?