What is the primary purpose of disconnecting power when using a multimeter?

The primary purpose of disconnecting power when using a multimeter is to protect against electrical shock. When working with electrical circuits, there is always a risk of live voltage being present. By disconnecting power, you eliminate the risk of accidental contact with live wires or components while taking measurements, which greatly enhances safety for the technician.

Ensuring user safety is paramount, as even low voltage can pose hazards. Disconnecting power allows you to handle circuit elements without the fear of electrocution or injury. This practice is fundamental for safe testing and troubleshooting in electrical work.

Other considerations, such as preventing equipment damage or ensuring accurate readings, can also be important, but they often become secondary to the critical concern of personal safety. Reducing battery usage is not a relevant reason for disconnecting power because measurements can be taken without affecting battery life in most cases.