Final answer:
The biggest advantage of using an automated external defibrillator is its ability to deliver a shock of electrical energy to correct abnormal heart rhythm, which can be life-saving in a cardiac emergency. AEDs provide verbal instructions for use and are designed for use by laypersons.
Step-by-step explanation:
An automated external defibrillator (AED) has several advantages, but the biggest advantage is its ability to deliver a shock of electrical energy to the heart to correct abnormal heart rhythm, such as cardiac or ventricular fibrillation. This can be life-saving in a cardiac emergency. AEDs are designed to be used by laypersons, and they provide verbal instructions for use to assist in the first crucial minutes of a person suffering from a cardiac attack.