For last week’s assignment we were asked to create a simple switch that, when closed, would turn on an LED. After watching my daughter spread food all over her highchair tray one night, I decided to try and use ketchup. Peep the video above for the results.
I wasn’t sure if the ketchup would conduct electricity at first, so I just decided to try it. I also found that the resistance of the ketchup was great enough that I could take the 220 Ohm resistor out of the circuit and still safely light the LED.