Water Light

Project Number: 67

Description: Connect the liquid energy source to the circuit shown here. Fill the compartments with water. Set the slide switch (S5) to position C. Set the meter to the 5V setting to see the voltage produced. The red LED (D1) may be dimly lit, depending on your local water supply. If you set the switch to position B, the voltage may be higher since the water is not trying to light the LED. Dissolve some salt in the water in all four compartments. The voltage will be higher and the LED should light now. See how long it lights the LED. Try replacing the red LED with the yellow LED (D5) or the clock (T2). See how long the water can run the clock. If you would like to set the time, see page 4.

Snappy: Salt and other impurities in the water react with the electrodes to produce electricity just like the cola does in Project 64. The voltage produced by the water is usually lower and the water will not run the LED or the clock for long.