On which factors does the resistivity of a conducting wire depend?

$A$ large number of free electrons are present in metals,yet no current flows in the absence of electric potential across it. Explain the statement with reason.

Why is parallel arrangement used in domestic wiring?

How many electrons will there be in $1.6 \ C$ charge?

$A$ child has drawn the electric circuit to study Ohm's law as shown in the figure. His teacher told him that the circuit diagram needs correction. Study the circuit diagram and identify the errors,then describe the correct circuit configuration.

If resistors are connected in parallel,the voltage across each remains the same.