Question

What does the term “Ohmic Heating” indicate?

• A. Heating in a microwave oven
• B. Heating in an induction cooker
• C. Joule heating
• D. Heating through radiation

Hint:

Ohmic heating = heat due to resistance of conductor (Joule’s law)

Answer 1

The Correct Option is C

Concept: Ohmic Heating
Ohmic heating refers to the heat produced when an electric current flows through a conductor due to its resistance. This phenomenon is governed by Joule’s law. Step 1: Joule’s Law of Heating}
The heat produced in a conductor is given by: \[ H = I^2 R t \] where:

• \(I\) = current
• \(R\) = resistance
• \(t\) = time

Step 2: Meaning of Ohmic Heating}
When current passes through a resistive material, electrical energy is converted into heat energy. This is called: \[ \text{Ohmic (or Joule) heating} \] Step 3: Identify correct option}
Among the given options:

• Microwave → electromagnetic waves
• Induction → magnetic heating
• Radiation → heat transfer method
• Joule heating → correct definition

Conclusion: \[ \text{Ohmic heating = Joule heating} \]