Question

State Joule's law of heating.

Hint:

This law explains why wires get hot when used and why fuses blow when current exceeds a safe limit.

Answer 1

Step 1: Understanding the Concept:
Joule's law describes the amount of heat energy produced by a conductor when an electric current passes through it.
Step 2: Detailed Explanation:
Joule's law of heating states that the heat produced in a resistor is:
1. Directly proportional to the square of the current (\( I^2 \)) for a given resistance.
2. Directly proportional to the resistance (\( R \)) for a given current.
3. Directly proportional to the time (\( t \)) for which the current flows through the resistor.
Mathematical expression:
\[ H = I^2Rt \]
Step 3: Final Answer:
The law states that heat energy is directly proportional to the square of current, resistance, and time.