What term describes the recording that measures electrical activity traveling between a negative and positive electrode?

• A. Electrode
• B. Wires
• C. Box
• D. Lead

Answer: (D)

The recording that measures electrical activity traveling between a negative and positive electrode is called a lead. A lead isn’t just a single sensor; it’s defined by the pair of electrodes and the potential difference between them. This difference in voltage is what the recording captures, showing how the electrical signal propagates from one site to another. The other terms don’t describe this measurement: an electrode is just one sensing contact, wires are the conductors that connect sensors, and a box is the device that processes signals. But a lead specifically represents the measurement between two points, which is why it’s the correct term. In practice, multiple leads give different views of the activity by comparing various pairs of electrodes.