Write the mathematical expression for Joule's law of heating.

Explanation

To write the mathematical expression for Joule's law of heating, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Joule's Law**: Joule's law states that the amount of heat produced in a conductor is directly proportional to the square of the current flowing through it, the resistance of the conductor, and the time for which the current flows.

2. **Identifying Variables**:
- Let \( H \) be the heat produced (in joules).
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