Answer:
The Electrocardiogram is a test that is used to measure the electrical activity of the heart. Each and every heartbeat is initiated by the electrical signal which is initiated from the SN (Sinoatrial) node, which is present at the top of the heart and travels to end of the heart.
An ECG monitors the electrical activity of the heart and gives a result as a moving line of peaks and dips. Actually, it measures the electrical current that is running throughout the heart and tells the doctor about the function of the heart.
It is used to detect the problem of the heart such as heart attack, abnormal heart rhythm, enlargement of the heart etc.