An electric fuse works on the :

Options

A. chemical effect of current
B. magnetic effect of current
C. lighting effect of current
D. heating effect of current

Answer

**Step-by-Step Solution:**

1. **Understanding the Function of a Fuse:**
- A fuse is a safety device used in electrical circuits to prevent excessive current from flowing through the circuit. It protects the circuit from damage caused by overload or short circuits.

2. **Identifying the Principle of Operation:**
- Fuses operate based on the principle of the heating effect of electric current. When a current flows through a conductor, it generates heat due to the resistance of the conductor.

3. **Analyzing the Options:**
- The options given are:
1. Chemical effect of current
2. Magnetic effect of current
3. Lightning effect of current
4. Heating effect of current
- Among these, the heating effect is the most relevant to the operation of a fuse.

4. **Explaining the Heating Effect:**
- The fuse wire is made of a material that has a low melting point. When the current exceeds a certain limit, the heat generated by the current causes the fuse wire to melt. This breaks the circuit and stops the flow of electricity, preventing potential hazards like fires or equipment damage.

5. **Conclusion:**
- Therefore, the correct answer to the question "An electric fuse works on the:" is the **heating effect of current**.

**Final Answer:**
- An electric fuse works on the heating effect of current.

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