So, thanks to this data we know that. The brightness of the bulb in U.S.A. it is \(\frac{1}{4}\) with respect to Europe.
9. -At a cost of $ 0.095 kw / hr. How much does it cost you to leave your backyard focus of 25w day and night for a year?
To solve this problem we must create our own formula, which we will call cost. To do this we have to put our data in the same units of measurement.
The first thing will be to convert the Kw to W: