What is the difference between cardioversion and defibrillation?

I am trying to study for my nursing test and I am a little confused about this. Please help, thanks!!

Cardioversion is a synchronized shock of an organized tachyarrhythmia like atrial fibrillation or PSVT. Don't forget to hit that sych button. It's considered bad form to kill somebody who isn't dying already. Ventricular fibrillation is unorganized activity that can't produce a pulse. You're trying to stop that heart in hopes it'll start back in a rhythm that will support life. If you're lucky, there will be a brief period of asystole and then the normal synchronicity of the heart muscle will get it to start back in a rhythm with a pulse.

Cardioversion is just a kick to get the heart back on a normal beating pattern. Defib is an actual shock because your heart is in VF (the ventricular side is fluttering not pumping) or some other shockable rythm.

Cardioversion is give when a patient has a conduction type arrhythmia,like a 3rd degree AV block. It's a less powerful shock,and the monitor is set on Synchronize so the jolt won't be given on the T-wave,when a QRS is present,that would send a patient into a lethal rhythm or stop the heart. Defibillation is used when a lethal rhythm like Ventricular fib or Ventricular tachycardia is present,and it doesn't matter if the shock is synchronized or not,there is no discernible QRS pattern present with these arrhythmia's. The shock is more powerful starting at 200 joules. Take care. SW FNP

cardioversion is when the heart is given a synchronised shock milliseconds apart to help the heart revert back to normal sinus rhythm from supraventricular tachycardia (SVT)for eg . If this fails then drugs are used, although its dangerous to have a heart rate this fast there is not as much urgency as in fibrilation.
Ventricular fibrillation is a cardiac arrest. the heart is not beating enough for an output and soon leads to asystole (flat line alhough line is never flat) A shock is delivered through the heart (200-360 joules) to stop the fibrillation (or quivering) This leads to asystole as the heart goes into cardiac stun, drugs are given cpr and hopefully the heart will restart in sinus rhythm.
Unlike TV you never defibrillate a flat line only ventricular fibrillation and PULSELESS ventricular tachycardia
taylor