Distilled water acts as ........ for electricity.

$A$ 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?

$A$ 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.

$A$ bulb is rated $220\;V$ and $100\;W$. What is the resistance of this bulb?

Give an example of a metal which is the best conductor of heat.

$A$ battery is a source of maintaining a constant potential difference across two ends of a conductor.