The following table gives the resistivity of three samples

Sample	$A$	$B$	$C$
Resistivity	$1.6 \times 10^{-8} \Omega m$	$5.2 \times 10^{-8} \Omega m$	$100 \times 10^{-6} \Omega m$

Which of them is suitable for heating elements of electrical appliances and why ?

What makes the electric current to flow through an electrolyte?

If the current $I $ through a resistor is increased by $100\%$ (assume that temperature remains unchanged), the increase in power dissipated will be ........ $\%$

What is the symbol used to denote ohm?

$(a)$ Explain how does a cell maintain current in a circuit.

$(b)$ In the circuit given below the resistance of the path $x T y=2\, \Omega$ and that of $x Z y=6, \Omega$.

$(i)$ 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 $x T y$ and $x Z y$.

Find out the following in the electric circuit given in Figure.

$(a)$ Effective resistance of two $8\,\Omega $ resistors in the combination

$(b) $ Current flowing through $4\,\Omega $ resistor

$(c)$ Potential difference across $4\,\Omega $ resistance

$(d)$ Power dissipated in $4\,\Omega $ resistor

$(e)$ Difference in ammeter readings, if any.