Answer: 4 A.
- A 0.25 A
- B 1 A
- C 2 A
- D 4 A
Correct answer: D. 4 A
Explanation: Short circuit: external R = 0. I = EMF/r = 2/0.5 = 4 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.