Question

Two bulbs, one of 200 W and the other of 100 W, are connected in series with a 100 V battery which has no internal resistance. Then,

• A. The current passing through the 200W bulb is more than that through the 100W bulb
• B. The power dissipation in the 200W bulb is more than that In the 100 W bulb
• C. The voltage drop across the 200W bulb is more than that across the 100W bulb
• D. The power dissipation In the 100W bulb is more than that in the 200W bulb

Answer 1

Answer: (D)

Components connected in series are connected along a single path, so the same current flows through all of the components. The current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component.
When two bulbs are connected in series the first bulb will receive more current. As the bulb has its own resistance, less current will flow to the next bulb.
Hence the power dissipation In the 100 W bulb is more than that in the 200 W bulb.