Answer: Zero.
- A Zero
- B Infinity
- C 1 ohm
- D Very high
Correct answer: A. Zero
Explanation: An ideal ammeter has zero resistance so it doesn't affect the circuit current when connected in series.
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.