What must be ensured before making circuit connections in a laboratory?

Before making circuit connections in a laboratory, it is crucial to ensure that the power is off. This is essential for safety reasons, as working with electrical circuits while they are powered can lead to electric shock or other hazardous situations. Turning off the power minimizes the risk of accidental short circuits, equipment damage, or personal injury.

Additionally, while equipment calibration, wearing safety goggles, and powering on for testing are important considerations in a laboratory environment, they are not specifically related to the immediate safety precaution required when making circuit connections. Ensuring that the power is off creates a safe working environment, allowing individuals to connect components confidently without the imminent risk of electrical hazards. This foundational principle underpins safe engineering practices and is paramount in both educational and professional settings.