Final answer:
To measure amps using a digital multimeter, the leads need to be connected in series with the circuit, which is necessary for the ammeter function of the multimeter to measure the current accurately.
Step-by-step explanation:
When using a digital multimeter to measure amps in a circuit, the leads should be connected in series with the circuit. This is because an ammeter (which is used to measure current) must have the same current flowing through it as flows through the component or part of the circuit being measured. To achieve this, you need to break the circuit and insert the ammeter such that it becomes a continuation of the line of current. Unlike a voltmeter, which is always connected in parallel to measure potential differences, an ammeter's design and functionality require it to be integrated into the circuit pathway.