Question

The current, I amps, in a wire is inversely proportional to the resistance, R ohms. When the resistance is 10 ohms, the current is 1.2 amps. Find an equation connecting I and R.

Answer 1

I =
`(12)/(R)`

Explanation:

given I is inversely proportional to R , then the equation relating them is

I =
`(k)/(R)` ← k is the constant of proportionality

to find k use the condition I = 1.2 when R = 10

substitute these values into the equation

1.2 =
`(k)/(10)` ( multiply both sides by 10 )

12 = k

I =
`(12)/(R)` ← equation of proportion