A normal ECG shows a consistent rhythm with uniform P waves preceding each QRS complex and a regular T wave, indicating proper atrial and ventricular depolarization and repolarization. The intervals and segments, such as PR, QRS, and QT, fall within normal ranges, signifying a healthy cardiac electrical activity.

Abnormal ECG Signal: Shows irregular peaks and dips, indicating unusual heart activity. This may suggest conditions like arrhythmias or abnormal heartbeats.