According to me the best answer for this question can be Joules law of heating. Which is nothing but H=I×I×R×T

Introduction:
The law that governs the amount of heat produced in a metallic conductor when current is passed through it for a given time is known as Joule's Law. This law establishes a relationship between the heat produced, the current flowing through the conductor, the resistance of the conductor, and the time for which the current flows.

Joule's Law:
Joule's Law states that the amount of heat (Q) produced in a metallic conductor is directly proportional to the square of the current (I) flowing through it, the resistance (R) of the conductor, and the time (t) for which the current flows. Mathematically, it can be expressed as:

Q = I^2 * R * t

Explanation:
Let's break down the equation to understand the different components:
1. I represents the current flowing through the metallic conductor. The unit of current is Ampere (A).
2. R represents the resistance of the conductor. The unit of resistance is Ohm (Ω).
3. t represents the time for which the current flows through the conductor. The unit of time is seconds (s).
4. I^2 represents the square of the current, ensuring that the heat produced is directly proportional to the square of the current.

According to Joule's Law, the heat produced in a metallic conductor is directly proportional to the square of the current, the resistance of the conductor, and the time for which the current flows. This means that if any of these factors increase, the amount of heat produced will also increase.

Practical Application:
Joule's Law has several practical applications, particularly in the field of electrical heating. It helps in determining the amount of heat generated in a conductor, which is crucial for designing electrical appliances such as heaters, electric stoves, and to calculate the power dissipation in electrical circuits.

Conclusion:
Joule's Law, expressed as Q = I^2 * R * t, governs the amount of heat produced in a metallic conductor when current is passed through it for a given time. This law provides a mathematical relationship between the heat produced, the current, the resistance, and the time. Understanding this law is important in various fields, especially in designing and analyzing electrical devices.