What is the simplest way to prove the light turns off in the refrigerator when the door is closed?
Problem: Observe the Unobservable
I posed the question "What is the simplest way to prove the light turns off in the refrigerator when the door is closed?" on Hubpages to see what ideas people could come up with to determine whether or not the light inside a refrigerator actually turns off when the door is closed. Here are the criteria I had in mind to determine the best solution:
- Must not damage the refrigerator
- Must provide direct evidence or proof that the light turns off when the door is closed
- Simple solutions preferred
- Inexpensive approaches preferred
- The simpler the better!
One solution was to simply press the button that the door presses when closed. If you press this button with the refrigerator door open, you can observe that pressing the button causes the light to turn off. This is simple, and does show that pressing the button causes the light to turn off.
But does the door firmly contact the button when closed? You could assume that it does. You could even measure the clearance and build a case that the door must press the button in far enough to trigger it when the door is closed. However this does not really provide direct proof. This solution gets points for simplicity, but does not provide proof that closing the door causes the light to turn off.
Going High Tech
The best solutions suggested using a video camera to record the action inside the refrigerator before, during, and after the door closes. This would provide direct evidence that the light turns off when the door is closed. Since the video camera is self-contained, it will not interfere with the closure of the door.
I think 15 or 20 years ago, this would not have been a simple solution since video cameras (or cell phones with video cameras) were not readily available. But now most cell phones have a video camera built-in. You can buy cheap digital video cameras that use flash memory for less than $30.
Isn't There a Better Way?
It seems that something simpler than recording video would be possible to determine whether or not the light turns off. A video camera records thousands (or millions) of pixels per second of video data. A simple experiment would take several seconds- this means that a few megabytes of data would be recorded to determine whether or not the light does in fact turn off. That seems like a lot of data.
It seems like only a few bits of data should suffice- rather than the megabytes of data provided by a digital video recording, but I have not thought of a simpler sensor to use than the video camera.
One thought was to check the temperature of the lightbulb- you could leave the refrigerator door open and let the lightbulb heat up to reach a stable temperature. After closing the door for some amount of time, the lightbulb should cool off if the lightbulb does actually turn off while the door is closed. Non-contact Infrared thermometers are available for about $20- these can be used to check for areas of your house that can benefit from additional insulation or caulking. But a $20 thermometer and a test procedure that may take several minutes is not as simple as using a video camera to obtain direct observations.
Proof that the Light in a Refrigerator Turns Off when the Door is Closed
Now it's time to apply the simplest method- digital video recording- to prove whether or not the light in a refrigerator turns off when the door is closed.
It took about 30 seconds to record video evidence that the light in the refrigerator does turn off when the door is closed. The video below shows about 5 seconds of placing the camera in the refrigerator. Then the door closes and the light turns off, which is recorded for about 5 seconds. Next, the door is opened and the light turns on again.
15 Seconds of Video Evidence
The Verdict: Does the Refrigerator Light Turn Off?
Yes, the light in a refrigerator does actually turn off when the door is closed.
© 2013 Dr Penny Pincher