If the R waves of leads I and II are both 4mV, what is the value of lead III?
a. 8mV
b. 1mV
c. -4mV
d. 0mV
e. -8mV
To find the value of lead III, you can use the formula for calculating the value of lead III based on leads I and II. Lead III is calculated as the difference between lead II and lead I:
Lead III = Lead II - Lead I
In this case, both leads I and II have R waves of 4mV. So, you can substitute these values into the formula:
Lead III = 4mV - 4mV
Simplifying this equation, you get:
Lead III = 0mV
Therefore, the value of lead III is 0mV. Therefore, the correct answer is (d) 0mV.