Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1 A. The current through the 40 W bulb will be:

Options

A. `0.4A`
B. `0.6A`
C. `0.8A`
D. 1A

Answer

To solve the problem, we need to understand how current behaves in a series circuit. In a series circuit, the same current flows through all components connected in the circuit.

### Step-by-Step Solution:

1. **Identify the Bulbs and Their Ratings:**
- We have two bulbs:
- Bulb 1: 100 W
- Bulb 2: 40 W

2. **Understand the Series Connection:**
- In a series circuit, the same current flows through all components. Therefore, if the current through the 100 W bulb is given as 1 A, the same current will also flow through the 40 W bulb.

3. **Current Through the Bulbs:**
- Since the current through the 100 W bulb is 1 A, the current through the 40 W bulb will also be 1 A.

4. **Conclusion:**
- The current through the 40 W bulb is also 1 A.

### Final Answer:
The current through the 40 W bulb will be **1 A**.