Answer: 60 W bulb.
- A 40 W bulb
- B 60 W bulb
- C Both equally
- D Neither
Correct answer: B. 60 W bulb
Explanation: In parallel, same voltage. I = P/V. 60 W bulb draws 60/220 A; 40 W draws 40/220 A. 60 W draws more.
In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.
Concept context
Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.