Where should an ammeter be placed to measure electrical current?

To measure electrical current accurately, an ammeter must be placed in series with the current path. This configuration allows the ammeter to become part of the circuit, ensuring that the current flowing through the circuit also flows through the ammeter itself. As a result, the device can measure the total current flowing in that part of the circuit.

When connected in series, the ammeter provides a complete path for the current, allowing it to operate without impedance. It's designed to have very low internal resistance so that it does not significantly affect the overall current in the circuit while providing a reading.

In contrast, placing an ammeter in parallel with the load or across a resistor will result in incorrect readings and could potentially damage the ammeter or the circuit, as it would create a short circuit condition. Therefore, for precise current measurement, the ammeter's series placement is essential.