State Joule's law of heating and write its mathematical form.

(N/A) Joule's law of heating states that the heat produced $(H)$ in a conductor is:
$(i)$ Directly proportional to the square of the current $(I)$ flowing through it, i.e., $H \propto I^2$.
$(ii)$ Directly proportional to the resistance $(R)$ of the conductor, i.e., $H \propto R$.
$(iii)$ Directly proportional to the time $(t)$ for which the current flows through the conductor, i.e., $H \propto t$.
Combining these three factors, we get the mathematical expression:
$H = I^2Rt$
Where $H$ is the heat energy in Joules, $I$ is the current in Amperes, $R$ is the resistance in Ohms, and $t$ is the time in seconds.