A defibrillator is a device used to deliver a shock to the heart to restore its normal rhythm.
Defibrillation.
pacemaker
the packed has been delivered is correct
No. The correct word is "abnormal."
correct
The correct spelling is delivered (brought).
That is the correct spelling of "deliver" (take to a recipient or destination).
The right (correct) spelling of electrical, is as spelt in your question.
Yes.
Both "have added" and "had added" can be correct, depending on the context. "Have added" is present perfect tense, indicating that something was added recently or is ongoing. "Had added" is past perfect tense, indicating that something was added before a specific time in the past.
No, you are never certain.
The correct spelling is electricity (electrical energy or power).
The correct spelling is rhythm.Some example sentences are:I love the rhythm in this song.He had an abnormal heart rhythm.
Physical layer