Answer: 1 A.
- A 0.5 A
- B 1 A
- C 2 A
- D 4 A
Correct answer: B. 1 A
Explanation: I = total emf/total resistance = 4/(1 + 1 + 2) = 1 A.
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.