Question

If I varies inversely with R and I = 0.25 when R = 18, which equation should be used to show this relationship?
A.IR = 0.45
B.l=4.5/R
C.I = 4.5R
D.l=R/4.5

Answer 1

@carolinagb02

Answer 2

@ParthKohli

Answer 3

Inverse relationship means that whatever you have for I and R, the product is ALWAYS THE SAME.

Answer 4

So then what do I do?

Answer 5

The question says that if I = 0.25 then R = 18. That means that IR = 18 * 0.25 = 4.5. But because I and R are inversely related, I*R is ALWAYS 4.5.

Answer 6

I * R = 4.5

Answer 7

Divide both sides by R

Answer 8

dont you mean I*R=0.45?

Answer 9

What is 18 * 0.25?

Answer 10

4.5

Answer 11

So it is IR = 4.5

Answer 12

but thats not an option i=r*4.5?

Answer 13

Divide both sides by R.

Answer 14

so l=0.25

Answer 15

Uh, nope.

I R = 4.5

Answer 16

ok then what?

Answer 17

Divide both sides by R in the equation above

Answer 18

but how do I do that?

Answer 19

@ParthKohli

Answer 20

Divide the left hand side by R and the right hand side by R.

Answer 21

ok so its l=4.5/R which is 18?

Answer 22

Madam, you have already obtained your answer.

Answer 23

oh omg thanks so much! :)