ESSENTIAL SKILLS
INVENTORY NUMERACY
S-3
AUTOMOTIVE SERVICE TECHNICIAN
NOC 7321Page 95Automotive Service Technician
NOC 7321- Use the formula C = πD to answer the following question.
If the diameter of a flywheel is 20”, what is the outside circumference?
____62.8”___
3.1416 X 20 = 62.8”
- You need to calculate the area of the top of a piston whose diameter is 82
mm. How would you do this?
(^) a = πr^2
_ a = πr^2 is the formula to use____
_a = 3.14 X (41)^2 ___
- You need to understand Ohm’s Law to diagnose problems in electrical
systems. The formula is:
E (voltage) = I (amperes) x R (ohms)
a) What is the formula for I? _I = E/R___
b) What is the formula for R? _R = E/I___
- Your timecard shows that you worked 9 hours each day for 5 days at $23.29
per hour.
a) Explain how you would determine your gross pay.
______P = hdr____(or P = h x r)_____b) Calculate your pay for the week.