Heating Effect of Electric Current

A bulb used in car Headlamps is marked $12 \mathrm{V}/60 \mathrm{W}$. Calculate the current flowing through it when lit?

Iron is a conductor of electricity, but when we pick up a piece of iron resting on the ground, why don’t we get electric shock?

How do we decide that a given material is a good conductor of electricity or is an insulator?

When we switch on a bulb to get light what energy transformation takes place?

What do you understand by electrical energy?

Write Joule's law of heating.

Which of the device does not depend on thermal effect of current?

It is advisable to use a material of low resistance in a heating coil.

Consider a current of $4\mathrm{A}$ passing through a coil and let the heat produced in the circuit be ${\mathrm{H}}_1$.  What happens to the heat if the current is decreased by $1\mathrm{A}$.

Calculate the amount of heat generated (in kJ) when $10 \mathrm{A}$ current flows through two resistors of resistance $1 \mathrm{\Omega }$ and $2 \mathrm{\Omega }$ respectively connected in series for $1$ minute.