How does the resistance of a wire vary with its cross-sectional area?

Identify the circuit (Figure) in which the electrical components have been properly connected.

The resistivity of semiconductor materials is $..........$.

According to Ohm's law,which of the following statements is correct?

$(a)$ Explain how a cell maintains current in a circuit.
$(b)$ In the circuit given below,the resistance of the path $xTy = 2 \, \Omega$ and that of $xZy = 6 \, \Omega$.
$(i)$ Find the equivalent resistance between $x$ and $y$.
$(ii)$ Find the current in the main circuit.
$(iii)$ Calculate the current that flows through the path $xTy$ and $xZy$.

What is the process of depositing a layer of gold on silver called?