Sometimes electric bulb does not glow even when electric switch is ON , then we say that

Options

A. electric circuit is closed circuit
B. electric current is low
C. electric bulb is fused
D. electric switch is working properly .

Explanation

**Step-by-Step Solution:**

1. **Understanding the Problem:**
- When the electric switch is ON, we expect the electric bulb to glow. If it does not, there is an issue that needs to be identified.

2. **Check the Connections:**
- First, ensure that the electric bulb is properly connected to the battery and that the switch is indeed in the ON position. This is crucial because a loose connection can prevent the bulb from glowing.

3. **Identify the Bulb Condition:**
- If the connections are secure and the switch is ON, but the bulb still does not glow, the next step is to check the condition of the bulb itself.

4. **Understanding the Filament:**
- Inside the electric bulb, there is a component called the filament. The filament is responsible for producing light when electric current flows through it.

5. **Check for a Broken Filament:**
- If the filament inside the bulb is broken, the electric current cannot flow through the circuit. This results in the bulb not glowing.

6. **Conclusion:**
- When the bulb does not glow despite the switch being ON and the connections being correct, we conclude that the electric bulb is "fused." This means that the filament is broken, and the circuit is incomplete.

**Final Answer:**
- We say that the electric bulb is fused.

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