When the ECG paper is traveling at the standard rate of 25 mm/sec, a large box in the horizontal direction equals:
A) 0.08 seconds.
B) 0.12 seconds.
C) 0.20 seconds.
D) 0.24 seconds.

Question

Quizplus · Accepted Answer

When the ECG paper is traveling at the standard rate of 25 mm/sec, each large box (which is 5 mm in width) represents 0.20 seconds. This is because 5 mm divided by the speed of 25 mm/sec equals 0.20 seconds.

When the ECG Paper Is Traveling at the Standard Rate