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

State Ohm's law. How can it be verified experimentally? Does it hold good under all conditions? Comment.

Electric power of a circuit is the rate at which work is done in maintaining the electric current in the circuit.

$(a)$ Calculate the resistance of the wire using the graph.
$(b)$ How many $176 \,\Omega$ resistors in parallel are required to carry $5\, A$ on a $220\, V$ line?
$(c)$ Define electric power. Derive the relation between power,potential difference,and resistance.

$A$ heater is joined in parallel with a $60\, W$ bulb and connected to the mains. If the $60\, W$ bulb is replaced by a $100\, W$ bulb,will the rate of heat produced by the heater be more,less,or remain the same?

In an electric circuit,state the relationship between the direction of conventional current and the direction of flow of electrons.