Question

What is the electric current produced when a voltage of `9 V` is applied to a circuit with a resistance of `66 Omega`?

Answer 1

Current `=136.364 " mA"`

Explanation:

`I=V/R` where `I` is the current, `V` is the voltage, and `R` is the resistance.
`color(white)("XX")`Think of it this way:
`color(white)("XXXX")`If you increase the pressure (voltage), you will increase the amount of current.
`color(white)("XXXX")`If you increase the resistance, you will decrease the amount of current.

Current is measured with a base unit of `A =` ampere which is defined as the current produced by `1 V` through a circuit with `1 Omega` resistance.

For the given values:
`color(white)("XXX")I = (9 V)/(66 Omega)`

`color(white)("XXX")=3/22 A = 0.136364 A`

For values in this range it is more common to specify the result in `mA` (miliamperes) where `1000 mA = 1 A`