Question

How much power is produced if a voltage of `2 V` is applied to a circuit with a resistance of `24 Omega`?

Answer 1

`166.bar6 " mW"`

Explanation:

`P=V*I` (power equals voltage time current)

`I=V/R` (current equals voltage divided by resistance)

`rArr P = V^2/R`

In this case
`color(white)("XXX")P=(2V)^2/(24 Omega)=1/6" W" = 166.bar6 mW`

`color(white)("XXX")`Note on Units used:
`color(white)("XXXXXX")1 " Amp" (A or "Ampere") = (1 V ("volt"))/(1 Omega ("ohm"))`

`color(white)("XXXXXX")1 " Watt" (W) = 1 V ("volt") xx 1 A ("ampere")`

`color(white)("XXXXXX")1000 " mW" ("milliWatts") = 1 " W" ("Watt")`