Is an ammeter placed in series or parallel to measure current?

• A. In parallel
• B. Across the load
• C. In series
• D. Across the power source

Answer: (C)

To measure current, the ammeter must be inserted in series with the circuit path so the same current flows through the meter and the load. This puts the meter in line with the circuit, ensuring it experiences and reports the actual current flowing through that path. Ammeters are designed with very low resistance to minimize any voltage drop and avoid significantly changing the circuit.

Placing an ammeter in parallel would create an alternate current path. Depending on the meter’s resistance, this could divert current away from the load or nearly short the source, leading to an incorrect reading or damage. Putting it across the power source would similarly bypass the load, giving a misleading measurement.

Thus, the correct arrangement is in series.