When connecting an A-base meter under energized conditions, it is critical to connect the current in ______.

• A. series
• B. parallel
• C. across the supply terminals
• D. to ground

Answer: (A)

To measure current, you insert the ammeter in series with the circuit so that the same current flows through the meter. An ammeter is designed with very low internal resistance, and placing it in series allows it to accurately monitor the load current without altering the circuit significantly. If you connect it in parallel or across a power source, the meter would present a low-resistance path and effectively create a short, potentially blowing fuses, causing equipment damage, and giving an incorrect reading. Grounding the meter would introduce an unintended fault path and safety risk. So, the correct approach is to place the meter in series with the energized circuit.