If there is a refrigerator handy in your residence hall or home, study the construction of the refrigerator to make these observations:
a. What energy source (gas or electricity) provides the work necessary to remove the heat? Can you find a power rating somewhere on the refrigerator?
b. Where are the heat-exchange coils that are used to release heat into the room? (They are usually on the back of the refrigerator, often near the bottom.)
c. Use a thermometer to determine the temperatures inside the refrigerator, inside the freezer compartment, near the heat-exchange coils outside, and in the room at some distance from the refrigerator. You should take measurements at different times to see how much these temperatures vary.