When using a multimeter as an ammeter, which lead is connected to the common jack?

When utilizing a multimeter as an ammeter, the black lead is conventionally connected to the common jack. This is because the common jack serves as a reference point for the measurement and is typically where the negative lead is connected in most electrical measurements. In the context of measuring current, this connection allows the multimeter to integrate seamlessly into the circuit. The red lead, on the other hand, is used for the positive connection when measuring, and may be connected to a specific input (like a 10A socket) if measuring high currents. Understanding this setup is critical for ensuring accurate measurements and proper functionality of the multimeter.