Current measurements are quite different than resistance or voltage measurements. When you’re making resistance and voltage measurements, you connect the meter’s test leads in parallel with a component. In contrast, when you’re making current measurements, you connect the meter’s test leads in series with the components or components under test. A typical ammeter connection is shown in this figure.

As you can see, this circuit has been opened and the meter’s leads have been connected in series with the other circuit components to complete the circuit.

When taking current measurements, like voltage measurements, you must work around an energized circuit.

Therefore, always pay attention to what you’re doing and avoid contact with energized circuit components. These energized components can create a lethal shock hazard!

A much safer way to measure high currents in AC and DC circuits is to use clamp-type probes. These probes measure the electromagnetic field around conductors rather than the actual current flow through them. By using these probes, you don’t need to open the circuit and connect the meter leads in series with the other circuit components.

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Good ol' review