What does a full function defibrillator consist of?

A full function defibrillator is designed to deliver a therapeutic shock to the heart in cases of life-threatening arrhythmias. The key component of a defibrillator is its ability to generate a significant and precise amount of energy to stop abnormal heart rhythms and allow the heart's normal rhythm to take over.

The correct choice is based on the need for an adjustable, high voltage direct current (DC) power supply because defibrillators operate by delivering a controlled shock that is high enough to depolarize the heart tissue, effectively "resetting" the heart's electrical activity.

An adjustable high voltage DC power supply enables the operator to set the energy level of the shock according to the medical guidelines and the specific needs of the patient. This capability is crucial in emergency situations where the intensity and timing of the shock can be critical for patient survival.

In contrast, the other choices either refer to AC power supplies or lack the necessary voltage and adjustability suited for effective defibrillation. Therefore, the specific configuration of a high voltage, adjustable DC power supply is essential for the proper functioning of a defibrillator.