7. A2.1W iPod is used for 30 minutes. How much energy does it use? __

## Step1: Convert Time to Hours### The time given is in minutes, but for our energy calculation, we need the time in hours. We know that 1 hour has 60 minutes, so 30 minutes is hours.## Step2: Calculate Energy### The formula for energy is Energy = Power x Time. The power of the iPod is given as 2.1 watts and the time is 0.5 hours. We substitute these values into the formula to calculate the energy: **Energy = 2.1W x 0.5h**