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Electrocardiogram (ECG) is a technique for monitoring the electrical activity of the heart, it has been of great value in diagnostics of metabolic and cardiovascular diseases, detection of arrhythmia and estimation of ventricular repolarization sequence. It has widely applied in diagnosis, clinical research, medical equipment development, etc. ECG measures the electrical potentials. The body is an electrical field, so when electrical charge is generated in the heart due to excitation of the heart muscle cells, this information will then be passed through the body and it can detected externally.

ECG signals are generated by the heart muscles. These signals are picked up by two types of electrodes which are attached to the body. The first type of electrodes is called limb electrodes and the second type is called chest or precordial electrodes. The limb electrodes are placed on the leg and arms of the patient in order to pick up the electrical signals. The ECG signals are also measured potentiometric. This means that the electrical potential is measured with respect to ground. The electrical signal is measured in volts (V) and the ECG amplitude is referred to as millivolts (mV).

The ECG working principle can be explained by the concept of electrical forces. When the electrical force is generated by the electrodes attached to the body, it passes through the heart muscle and creates small electrical fields. These fields move through the heart and can be detected externally. Since the fields move through the body and each type of heart beats rhythmically, then a different shape is produced each time and this helps physicians to diagnose various heart conditions. Apart from its usage for diagnostics, electrocardiogram is also used for research purposes, such as studying the details of electrical conduction system in the heart and gathering information about the heart\'s functioning.

Today, modern ECGs use digital signal processing and sophisticated algorithms to detect any abnormalities in the heart signals. This enables more accurate diagnosis and reduces the possibility of misdiagnosis due to errors in reading the signals. In addition, these digital ECGs also provide clearer images which make interpretation easier for physicians. They also have a higher resolution which allows the physician to see small details in the signal.

In conclusion, the ECG technique has many applications in the medical field, such as diagnostics, research, medical equipment development, etc. It utilizes both electrical and potentiometric signals from electrodes placed on the body. Besides, modern ECGs use digital signal processing and sophisticated algorithms which make it easier for the diagnosis and interpretation of the signals.

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