When configured to measure current, how is a multimeter connected to a component?

To measure current, a multimeter configured as an ammeter must be connected in series with the component. This means you must physically break the circuit and insert the meter so that all the current flowing through the component also flows directly through the meter. Ammeters are built with a very low internal resistance so they do not impede the current flow or drop the voltage significantly. If you accidentally connect an ammeter in parallel across a power source, its low resistance will cause a short circuit, which can blow the meter's fuse or damage the device.