Question

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

• 0.4 A

• 0.6 A

• 0.8 A

• 1 A

Answer 1

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

Explanation:

In a series circuit, there is only one path for the electric charge to flow. Because of this, the current remains the same at every point in the circuit, regardless of the resistance or power rating of the individual components.

1. Series Connection Rule: I_total = I₁ = I₂ = ... = I_n.
2. Since the 100 W bulb and the 40 W bulb are connected in series, the same flow of electrons must pass through both.
3. If the current through the 100 W bulb is measured as 1 A, the current through the 40 W bulb must also be 1 A.