What is the resistance of insulating materials?

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

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

Which electrical appliance with the given rating will draw the maximum current from the source?

$(a)$ Derive the formula for the calculation of work done when current flows through a resistor.
$(b)$ One electric bulb is rated $40 \ W$ and $240 \ V$ and another is $25 \ W$ and $240 \ V$. Which bulb has higher resistance and how many times?

If $1 \text{ ampere}$ electric current passes through a conductor,how many electrons will pass per second?