Real-Life Math -- Solution
You need to calculate the resistance. This is what you know:
V
= 40
i = 10
This is the formula:
R x i = V
You
need to isolate R. You do that by dividing each side by 10.
R x
i = V
R x 10 = 40
R = 4 ohms
Now you need to calculate
the percentage difference. You know the resistance for a working line is 2
ohms.
Percentage = 4 ohms / 2 ohms x 100
Percentage = 200
There
is a 200 percent difference. It looks like your hunch was right!
You
need to be comfortable with math as a telecom tech.
Donna Best says
the use of math depends on where you work. "It all depends on the job," she
says. "You can certainly get by without it because [telecommunications] is
more technical."
But there are a number of common tasks that require
math. "If you are installing a switch, and you are going to have 500 users,
you sort of have to figure out how many trunk [lines] you are going to need.
It is usually one per every 10 people."